The Wollenberg Bunker – Linking East Germany and the USSR

Heading to Berlin or the former GDR? Looking for traces of the Cold War open for a visit?

A Travel Guide to COLD WAR SITES in EAST GERMANY

Second Edition - 2024

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The events taking place on the geopolitical stage during the last decade of the Cold War – the 1980s – gave little indication of the imminent collapse of the Soviet-led Eastern Bloc (1989-1991). Correspondingly, looking at the amount of technology developed and deployed in the military field during the late, hi-tech stage of the Cold War, it is easy to notice that opponents on both sides of the Iron Curtain dedicated a significant (and even increasing) budget in preparation for a possible total confrontation. Reading papers and specialized books from the time, the outbreak of an open conflict, such to put a violent and abrupt end to years of opposition between the two opposing systems by recurring to nuclear warfare over the territories of Western Europe (most of them belonging to the NATO alliance, and all being substantially more militarized than today), was not deemed just likely, but more as a matter of time.

The БАРС system – The tropospheric network of the Warsaw Pact

In that era of extreme tension, it is not surprising that one of the most sophisticated and expensive assets developed and deployed jointly by all Nations in the Warsaw Pact, of course led by the USSR, came alive. History would cut its life short though, and as soon as the Warsaw Pact disintegrated, as a result of the opt-out from communist dictatorship of all Countries in Eastern Europe, this asset was decommissioned. This system was the tropospheric communication system ‘БАРС’, a Russian word reading ‘BARS’ and meaning ‘snow leopard’. The name stands as an acronym for four words in Russian, which translate into something like ‘Sheltered autonomous radio communication system’.

The idea put forward by the Soviet top-ranking military staff in the early 1980s (prior to the onset of Gorbachev administration) was that of a system capable of transmitting complex orders (not just simple signals, like for opening a bunker door or silo, but articulated messages) in a safe encrypted way, at a long distance and minimizing the chance of a complete breakdown even in case of an enemy nuclear attack. Despite being not new, the concept of a resilient and reliable system, such to allow exchanging significant amount of data without relying on cables, had been tested in earlier stages of the Cold War only for short-radius operations. Mobile transmitters/receivers, loaded on purpose-designed trucks, allowed for a reduction of the risk of a direct hit from an attacker, and for a quick redeployment in case of need. However, for the amount of data and range required for the coordination of a war scenario, involving many different Countries, and geographically encompassing an entire continent, a different system was required, capable of transmitting more massive data flows on longer distances, with a reduced risk of a sudden or complete interruption.

The БАРС system was based on a certain number of stations, scattered over the territory of the Countries of the Warsaw Pact. Each node was built as a bunkerized, manned military installation, featuring high-power, high-frequency fixed antennas emerging from the ground, and an underground shelter protecting all the technical gear required for manipulating the data to be sent or received, interfacing with the other existing local (i.e. national) networks for military and executive governmental communication, and of course managing the tremendous amount of energy required to pump a long-reaching signal into the ether.

Laying on the front line with the West, hosting a Soviet contingent of some hundred thousands troops (see here and links therein), aircraft (see here), missiles (see here) and nuclear warheads (see here), and being a key-ally of the USSR in case of the outbreak of an open war (at least until late 1989), the German Democratic Republic (or GDR, or DDR in German) was clearly included in the БАРС network from the initial drafting phase. Similarly, Poland, Czechoslovakia, Hungary and Bulgaria, and of course the Soviet Union (which included Belarus and the Baltics, and stretched west to Kaliningrad), all had БАРС stations on their territory. Stations were located at a range of a few hundred miles from one another, thus within the range required for each of them to communicate with one or more of the other nodes. Data (e.g. orders, reports or authorizations) input locally could be relayed along the network through intermediate nodes, down to the intended destination node. There were 26 nodes in total, of which four were in the USSR.

The Wollenberg site – Bunker 301 ‘Tushurka’

The GDR in particular had three stations built, all along the border with Poland, and located east of Berlin – namely Station 301 in Wollenberg, at the same latitude of Berlin, Station 302 in Langsdorf, towards the Baltic coast, and Station 303 in Röhrsdorf (near Königsbruck), not far from Dresden in the southeast of the GDR territory. The first among them, the Wollenberg site (codenamed ‘Tushurka’) could communicate with the other two national stations, as well as with Station 207 in Poland, from where data would be transmitted further down the network, towards the USSR.

The site was built by the GDR state, with technical hardware coming from several Countries within the Warsaw Pact, and most of the military hi-tech components manufactured in the USSR. The actual site (similar to its sister sites) was built in the frame of a highly secretive operation. The staff comprised about 60-70 men, the majority of which were military, where about 15% were civil technicians. Maximum security clearance was required, due to the top-secret nature of the installation and of the overall БАРС system. The bunkerized part of the installation was only a component of the larger premises of the base, camouflaged within the trees on the side of low-rising hill.

As pointed out, the immense spending required for setting up this multi-national hi-tech military communication system, which was extensively tested and completely commissioned (as a network) by 1987, did not save it from a quick demise and disappearance. In particular, Station 301 went definitively offline as early as August 1990.

However, the fate of the Wollenberg site was not so sad as that of many former Soviet or NVA (i.e. the East German Army) installations in the GDR. The high-power antennas were torn down, but except from that, little material damage was inflicted to the buildings and bunker on site. The place was basically shut-off and left dormant, until when a society of technically very competent local enthusiasts started a plan to preserve and open it to visitors, as a memorial specimen of the technology of the Cold War years.

A visit to the Wollenberg bunker site reveals a tremendous deal of interesting details, very uncommon to find elsewhere in the panorama of Cold War relics around Europe. Thanks to a careful preservation and restoration work, the bunker has most of its original systems still plugged to the grid and lit-up – some of them are reportedly still working! Even though the communication networks have been severed, the experience in the bunker is really evoking, and the atmosphere – with all the lit-up cabinets, lights, CCTV cameras, 1980-style screens, etc. – closely resembles that of the bygone era when БАРС was operative!

This report and photographs were taken during a private visit to the bunker, carried out in the Summer of 2023.

Sights

A visit to the the installation in Wollenberg starts from the original high-security access gate. As you may quickly notice when passing through it and getting a first view of the site, the state of preservation is exceptional. Except for the lack of military staff around, everything looks mostly like in the years of operation.

A group of soft-construction service buildings and a reinforced multi-entry garage constitute the first – and visible – nucleus of the installation. All buildings are painted in a camo coat.

A former building for the on-site staff has been turned into a permanent exhibition, with memorabilia items from the Cold War years, when the Nationale Volksarmee (or NVA, the Armed forces of the GDR) cooperated with the Soviet Red Army and the national Armed forces of other Countries in the Warsaw Pact.

A meeting room, now employed also for small gatherings, is especially rich of interesting and diverse items, including emblems, books, memorial plates and pennants, as well as TV screens, hi-fi systems and and beamers from the era.

Another room has been set-up as a control center for the base, with an original console and regional maps.

Compared to military bases (for aircraft or tanks), the Wollenberg installation is rather compact, with a main road giving access to most of the (not many) buildings on site, as well as the bunker. Actually, the bunkerized part was built under a low-rising hill, with the antennas originally standing on top of it. Access to the bunker is possible either by climbing uphill on the main road, or through a suggestive original pedestrian tunnel. The latter starts from within the service building itself, and – somewhat unexpectedly, for an underground installation – it climbs uphill, while keeping beneath the surface of the hill side slope. The lower end is guarded by an original CCTV camera.

At the top end of the tunnel you can find the actual access to the bunker. The design and reinforcement level conferred grade ‘D’ protection according to the military standard in use at the time, with grade ‘A’ being the strongest. Access is through an airlock, constituted by two tight doors at the opposite ends of a small vestibule built in concrete. This design allowed protection from the blast of a nuclear device.

Notably, the locking mechanism of the tight doors is Soviet military standard, which can be found in high-value installations like nuclear depots elsewhere in the Eastern Bloc (see for instance here in Poland, and here in Czechoslovakia).

To the visitor with some experience of Cold War installations, it will be apparent from the very start of the tour that the state of conservation of the bunker, including the systems in it, is exceptional, similar to the rest of the Wollenberg site. The original warning lights and the CC-TV camera for identifying people at the entrance are still in place.

Next to the entrance, a control room with technical gear for checking-in can be found – including original dosimeters for radiation and chemicals, mostly Soviet-made. Looking inside these devices is possible, and reveals a great deal of sophistication in the design and realization of the military-grade material from the time.

Showers and sinks for washing, as well as canister for disposing of contaminated clothes, are located in the same area.

Upon getting access to the sealed area of the bunker and passing by the decontamination facility, you find yourself on the top floor of the underground bunker. The high-technology gear required for the transmission/reception of data on the БАРС network, as well as the interface with other national communication systems, required for receiving data, issuing orders, etc. over the territory of the GDR, were located on this floor.

Two symmetrically placed rooms host two twin transmission centers for the БАРС system. A single manned console can be found in each of them, surrounded by electronic cabinets and switches. At a closer look, all the material herein is Soviet made, and labeled in Russian only.

On the wall ahead of the console station is a set of cables, communicating with the antenna and allowing to set the orientation and monitoring its status.

The actual signals transmitted to the antenna, or received from it, traveled along special hollow ducts, with an almost rectangular section. Bundles of these ducts can be found in the ‘Sender’ (which means ‘transmitter’ in English) room, immediately next to the room where the manned console is.

The modulation and demodulation of the signals going out and coming in respectively through the antenna on top of the bunker required some special pieces of electronics, which included the Soviet-designed KY-374 klystron (codenamed ‘Viola’), a component to be found in the cabinets of the ‘Sender’ room.

Following the hollow ducts, it is possible to find where they finally exit the usually manned part of the bunker, bending into receptacles and leading outside. Piping related to other systems, including air conditioning, can be seen as well crossing or running in the same narrow technical corridors.

Beside the consoles monitoring the antenna and the data flowing through it, a kind of operative room for communication can be found, where consoles allowing to receive and forward data and communication to/from all systems are on display. This largely original room features consoles of different levels of technology.

Original explanatory schemes showing the basic features of the БАРС system are on display in that area – in Russian!

An adjoining room features the cabinets required for making all these system work. The cabinets are really many, with a significant share of material manufactured in the USSR. The sight of all these cabinets together is really impressive, and tangibly provides the feeling of a high technology, sophisticated and expensive design. It compares well, but in a largely up-scaled fashion, to the electronics to be found in some special communication bunkers on the western side of the Iron Curtain (see here).

Interspersed with the original arrangement of the cabinets and consoles are some displays of original material. These include specimens of different types of cables for signal transmission – some of them hollow and pressurized, others featuring impressive bundles of thinner wires – the KY-374 klystron, and other once top-secret core components of the БАРС transmission system. Also on display is one of the few remaining parts of the original system of antennas, once on top of the bunker. The antennas were the only part to be physically torn down when the system was decommissioned, upon the demise of the Warsaw Pact and the end of the Cold War.

The bunker was manned by military and technical staff 24/7. Furthermore, as typical for bunkers from the Cold War era, provision was made at a design level to allow the staff to live isolated within the bunker for an extended period of time, in view of the eventuality to face a nuclear fallout scenario.

On the same floor as the technical rooms, the commander of the station had his own private room. This is still adorned with typical Soviet iconography, as well as everyday material from the age when the bunker was operative.

A small canteen, with a kitchen and a modest living room, can be found at the same level. An original storage room has been employed to gather examples of everyday products, like soap, skin care cream, etc., as well as canned food, cocoa, and beverages of all sorts.

This represents a very rich catalog of now largely defunct and forgotten labels, from the age and regions of the Eastern Bloc (and especially from within the GDR). Also on display are bottles of spirits, likely still very good!

The visit proceeds then to the lower floor, which can be reached through a flight of metal stairs.

The lower floor host the plants required for the regular operation of the entire bunker, such to guarantee operational ability even in case of an enemy attack carried out with nuclear, chemical or biological warfare. The air filtering and conditioning system is very modern. Beside typical filtering drums for particles, to be found also in other bunkers (see for instance Podborsko here), you can see a bulky filtering and climate conditioning system, neatly arranged within two parallel square-shaped ducts. Filtering against chemicals as well as biologic agents was carried out employing special active filters.

Sensors for the level of contamination of the bunker air can be found in different rooms. Much material here is standard Soviet-made.

Systems for water pumping and compressed air can be found as well, including compressors, pumps and reservoirs. Looking at the always interesting factory labels in this area, it is easy to find export products of Bulgaria, Romania and other communist dictatorships of the era. Of course, much hardware is also manufactured in the GDR.

Electricity was supplied from the outside grid, yet capability for self-sustaining in case of a grid loss (for instance in case of war) was implemented as well. Three big German-made Diesel generators have been put in place, and are still in an apparently good condition.

Another example of the high technological standard reached in the late Cold War era is represented by the control room for the plants within the bunker. A manned control station, with a console and a direct view of lit-up cabinets, reporting the status of the various systems running in the bunker, compares well with control rooms of large industrial plants in operation today.

Carefully kept in its original status, with many of the electric links and cabinets still working, the sight of this room is especially evoking.

Also on the lower floor are the sleeping rooms for off-duty staff. Typically, this was not employed except for drills, when the bunker could be sealed to simulate operations in case of the outbreak of hostilities.

Back to the upper floor, it is possible to exit the bunker via a stairway and through a side gate. You will find yourself on top of the low-rise hill where the bunker has been dug. Here the concrete base of the crane where the БАРС antenna used to sit are still visible. Notably, these antennas were much smaller than the tropospheric antennas employed for the TROPOSCATTER system of NATO. This was the result of a different bandwidth employed for transmissions. Therefore, even in the days of operation, the antennas on top of the bunker were not as sizable as those of TROPOSCATTER installations (which were enormous in size).

Looking closely, in the top area of the installation, the duct for supplying the Diesel oil tank of the bunker can be found, similar to sensors for radiation and other atmospheric parameters (similar to what can be found also in other nuclear-proof bases, for instance here). These allowed to monitor the conditions of the outside air, detect an attack and trigger or manage the sealing of the bunker in case of need, by locking all the tight doors.

This access to the bunker is fenced by the original electrified fence, severing this area from the rest of the installation through a further layer of security.

All in all, a visit to the Wollenberg bunker offers an incredible insight in a fascinating and crucial field of warfare – data and communication exchange – as well as a lively and evocative display of a late Cold War hi-tech installation from the Soviet side of the Iron Curtain!

Getting there & Visiting

The German name of the Wollenberg bunker is ‘Militärhistorisches Sonderobjekt 301 Wollenberg’. It can be reached very easily with a car. It can be found in the open countryside along the regional road 158, driving about 35 miles (about 1 hour) northeast from downtown Berlin towards Poland. The exact location is between the small village of Höhenland (~4 miles) and the more sizable Bad Freienwalde (~6 miles). There is a large parking area immediately next to the road, giving direct pedestrian access to the premises of the former military installation. Despite being placed very conveniently, the site is rather elusive when passing by, since it is hidden in the trees and not directly visible from the road. The address corresponding to the place in Google Maps is Sternkrug 4, 16259 Höhenland. The inconspicuous village of Wollenberg, giving the name to the installation, is just nearby, but it is not crossed by the regional road, and it should not be employed for pointing this destination with a nav.

The Wollenberg bunker is a listed historical installation. It is perfectly maintained, privately managed, and it can be regularly accessed with guided tours. These are offered typically one day per week in the summer, or by prior arrangement. Possibly the best option for getting the most out of your visit is getting in contact with the group of very knowledgeable enthusiasts running the place. The official website is here (do not be discouraged by the ‘static’ appearance of the website, they are very active, and they shall typically answer your inquire).

My visit was planned by initiative of Dr. Reiner Helling (see also here), and we visited in a group of three, including the guide (Dr. Michael Schoeneck, a former engineer, with a profound knowledge of any technical aspects related to this installation), which happened to be a perfect option for touring also the narrowest receptacles of the bunker. Visiting in groups too big may be not advisable, since the rooms and corridors are rather narrow, and the place may turn overcrowded for interacting with the guide and for taking good pictures. I think the visit – including the technical content – may be tailored to the needs of the audience. For technical-minded subjects, historians and former military, a visit may take about 2-3 hours (the latter was my experience). In my case, the guide could understand but not speak fluent English, yet Dr. Helling could translate with ease all the explanations. Of course, if you have at least a basic knowledge of German and of the technical material you are looking at, this may simplify your visit, which is in any case highly advisable for those interested in military technology and the Cold War.

Heading to Berlin or the former GDR? Looking for traces of the Cold War open for a visit?

A Travel Guide to COLD WAR SITES in EAST GERMANY

Second Edition - 2024

DON'T LEAVE IT AT HOME! AVAILABLE in PAPERBACK or KINDLE from your national Amazon store!
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amazon.it | amazon.fr | amazon.co.jp

Preserved Cold War Bunkers in Northern England

The central role taken by Britain in WWII, firstly containing and then countering the expansion of the Third Reich, is duly and proudly celebrated all around the Country, with memorials and thematic exhibitions, often hosted in historical locations, regularly open for a visit.

The United Kingdom joined NATO as a founding member in 1949, and had already been at the forefront of a European anti-Soviet alliance with France since 1947. The strategic political and military ties with the US, pivotal in putting and end to WWII in Europe, were kept over the following decades, against the menace constituted by the Eastern Bloc. Thanks to its geographical position, and bolstering a nuclear arsenal, strategic bombers and submarines of its own, Britain was a major player of the Cold War.

Despite that, the Cold War left behind comparatively less memories than WWII, with only a handful installations open to the public, and somewhat out of the spotlight. In this regard, this reflects an attitude generally widespread in Europe towards the traces of the second half of the 20th century.

However, for people with an interest in the Cold War age, and more in general for those with a thing for (especially nuclear) warfare technology, there are two really unmissable sights in Northern England, which make for a vivid hands-on experience of the ‘era of Soviet threat’.

One is the Hack Green Secret Nuclear Bunker, with a fascinating history starting in WWII and spanning the entire duration of the Cold War. Here one of the finest collections of nuclear-war-related material in Europe can be found, together with much additional material from the era, in a largely preserved historical site.

Another is the York Cold War Bunker, built in the Cold War age to provide protection to the staff of the Royal Observation Corps (ROC) in case of a nuclear attack, as well as the ability to help coordinating fundamental public functions – health, transportation, food and energy supply, etc. – in a post-attack nuclear fallout scenario.

Both sites are regularly open for a visit, and provide a vivid testimony of civil and military plans and facilities seriously prepared in England for a nuclear apocalypse scenario.

Sights

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Hack Green Secret Nuclear Bunker

The Hack Green site is located deep in the Cheshire countryside, about one hour driving south of Manchester. Actually, it is in a really secluded location, far from any sizable urban center, and away from major roads. Even today, when this facility is working as a top-level museum, some attention to the signs is needed to reach the site.

Once by the gate, you are immediately driven back in time by the appearance of the tall military-style external fence with official government signs, and by the blunt and in impenetrable appearance of the big concrete bunker – what you see is only the part above ground level! – with a big antenna protruding from the top. Nearby, you can see an apparently still off-limits area, with a now-dead radar antenna and an old Jet Provost trainer in RAF colors.

History

The history of the Hack Green site dates to as back as WWII, when it was established as one of the 12 most developed Ground Controlled Intercept (GCI) centers, out of 21 total nodes in Britain. Essentially based on the airspace scanning radar plants available at the time, the so-constituted ‘Chain Home’ surveillance system was operated by the RAF, and intended to track intruding German aircraft, thus directing air force planes against them. Radar aerials appeared on site at the time, suitable against relatively slow moving propeller-driven aircraft of those years.

With the start of the Cold War, and the need to reconfigure the defense against the USSR and Warsaw Pact forces operating with jet-powered aircraft of increasing speed, several modernization plans were started in Britain, aimed at implementing more effective detection and threat-countering radar technology, like ‘Green Garlic’, and later ROTOR. The latter called for the institution of a chain of detection nodes, not much dissimilar in concept from the older ‘Chain Home’ of WWII, but much more articulated, efficient and technologically advanced. At the time one of the most expensive government-funded operations ever, 66 installations were implemented all over Britain within ROTOR before the mid 1950s, with different roles in the network. The bunker you see today on the Hack Green site was one of them.

Keeping up with the fast-developing offensive technology of the 1950s and 1960s required a continuous update of the defensive network, in particular asking for the addition of intercontinental missiles to the enemy arsenal to counter. The US-led ‘Ballistic Missile Early Warning System’ (BMEWS) included 12 early-warning radar stations around the Atlantic, including a single station in the UK (RAF Fylingdales, Yorkshire, still in operation today). Before BMEWS went operational (early 1960s), triggering a re-organization of all other defense radar systems by the time obsolete, Hack Green took an interim role as one of only 4 radar stations operated by the RAF monitoring all military and civilian traffic through the British airspace, coping with new fast jetliners. The name of the Hack Green radar site in that stage was ‘Mersey Radar North’. Finally, in 1966 the RAF released the site to the government, which put it in mothballed status.

It was in 1976 that a new life began for Hack Green. Starting in 1958, the Home Office invested much in the preparation of an emergency structure, capable of keeping of managing a post-nuclear attack scenario, and keeping the basic public functions active. In the event of a total nuclear war, a failure of the national hierarchy and military chain of command was forecast, as a result of an extensive damage to the infrastructures and communication systems. In order to recover as fast as possible in such an emergency, the UK would split in 11 regions, each with a regional seat of government (RSG). In the region, a civil Regional Commissioner would take a leading administrative role, and would be responsible for coordinating disaster recovery operations, like supplying medical resources, food, water, and reconstructing infrastructures, while waiting for the national government to reactivate its functions. The Commissioner would be aided by the UK Warning and Monitoring Organization (UKWMO), which took over the function and organization of the older Royal Observation Corps (ROC) established during WWII. This structure was further potentiated in the 1960s and 1970s, also introducing a similar regional scheme for the military in case of a nuclear attack.

The seat of the RSG was in the Regional Government Head Quarters (RGHQ). Following some years when it was hosted in Preston, then in Southport, north of Liverpool, the RGHQ for the 10th region (then 10:2, following a split in two halves of this large region) found its home in Hack Green. The former radar facility was potentiated enormously, and set up with the ability to host 160 civil and military staff for 3 months without resupply in case of a nuclear attack on the UK.

Within the framework of the emergency plan for a nuclear attack, the RGHQs all over the UK went on operating until the demise of the USSR in December 1991, to be soon deactivated over the following years. Hack Green was scrapped of all content, and put up for sale in 1993. It was privately acquired in the mid-1990s, and carefully restored in some parts, or being stocked with interesting material from the Cold War era in some of the many rooms.

A tour of the bunker

Access to the bunker is via a concrete slide, and through a metal gate. Originally the male civil servants dorm, the first room you meet is now a kind of storage for items recently incorporated in the collection. These include a jeep, a model of an Avro Shackleton, and interestingly a nuclear warhead. The original system to activate the rooftop antenna is in a cabinet along a sidewall.

The ticket office and canteen are now in the original canteen area of the Hack Green site. Restored to a 1960s appearance, parts of the kitchen furniture are original from the site. Along the sidewalls are several memorabilia items, including some original Soviet emblems, not unusual today in museums on the other side of the Iron Curtain (see for instance here), but hard to find in the UK.

An adjoining room reproduces the environment where the ROC would have worked in case of a drill or real nuclear attack. Among their function was the pinpointing of nuclear explosions. The forecast and monitoring of the fallout is strongly bound to the local weather and winds. This was kept under surveillance through reporting stations scattered on the UK territory (more than 1 thousand), which transmitted information to Hack Green and other RGHQ and UKWMO bunkers (see the York bunker later in this post). They could then coordinate recovery operations, avoiding extreme exposure to radiation of the emergency staff.

Monitoring was through dedicated sensors, and communication through specific transmission gear. Two display cases in the same room feature interesting instruments, training documents, and memorabilia items from the rich history of the ROC, documenting also their activities in WWII.

Ground floor

The Hack Green bunker largely retains its original arrangement. It is composed of a ground and an underground floor. Along the main corridors are interesting examples of the papers produced by the UKWMO, and by the civil defense service during the Cold War. Among them, are leaflets for the population, with best practices in case of a nuclear attack.

Also interesting are more technical posters from the era, either outlining the role of the public organizations monitoring a potential nuclear apocalypse scenario, or providing technical details on the effects of nuclear weapons – what to expect in terms of damage or health issues, depending on the type and local condition of a nuclear explosion.

For sure a focal point in the exhibition of Hack Green today is the display of nuclear warheads, and nuclear-related material. Hosted in a room previously employed by emergency staff, the exhibition retraces with original material, mock-ups, rare pictures and videos, the history of the British nuclear arsenal, managed by the Atomic Weapons Establishment (AWE).

The WE177 was designed to constitute the backbone of the air-dropped nuclear deterrent of the UK. Examples of this bomb are on display together with technical material employed to monitor their status and manage launch or drills. In service between the 1960s and the 1990s in association with larger strategic bombers like the Vulcan, or smaller fighter-bombers like some versions of the Harrier or Jaguar, it could be assembled in some different versions, sharing the same baseline construction, but with nominal yields ranging between 10 to 450 kilotons.

Also on display are pictures and mock-ups of the old Polaris warhead, together with the original casing employed to transport this 200 kilotons item! A US design, the Polaris was acquired by the UK in 1963, to supply the Royal Navy and constitute the UK underwater deterrent. The Polaris missile featured a three-warheads fuse, bearing a total yield of 600 kilotons.

A very rare artifact is the warhead of project Chevaline, a British design to improve the potential of the Polaris, which saw limited service with the Royal Navy in the 1980s. The Polaris/Chevaline was replaced by the Trident missile system, still employed today in the nuclear deterrent role.

Besides the central exhibition of nuclear warheads, the display cases in the same room offer a wealth of super-interesting technical gear and memorabilia related to nuclear weapons. These include components and cabinets of radio and radar systems, to be transported on board aircraft or to be employed on the ground. These parts come from different ages, and from several Countries, including the Eastern Bloc – for instance, a very rare Soviet suit to work on high-power radar antennas for maintenance. Powerful radars actually emit rays with a high power-over-volume (power density) ratio especially in the vicinity of the emitting apparatus. This may even turn deadly for humans (roughly like being in a microwave oven would be!), and precautions are needed when working in such environment.

A really unique collection on display is related to Geiger counters and dosimeters. These include environmental and personal use devices, from various ages and nationality.

Two display cases are dedicated to material coming from beyond the Iron Curtain, most notably from the USSR and the GDR! It is really hard to imagine how this material could manage to come to Hack Green.

Part of the display is dedicated to the civil defense corps of different Countries, with helmets, emblems, papers and uniforms, showing how similar actions in preparations for a nuclear war were carried out in many Nations of continental Europe, also in the Eastern Bloc. Actually, a very close relative of the UKWMO RGHQ control center, with a totally similar function, can be found in a perfectly preserved condition in Poland (see this post).

More memorabilia items come from the history of civil defense in the UK. Among the most rare artifacts are the only surviving example of the ‘Queen’s telephone’, which was employed for enforcing the Emergency Power Act, which among other things may have transferred power to the Regional Commissioner. There used to be one such phone in each of the RGHQ, but all were destroyed for security reasons following the shut-off of the bunkers, except this one, and the one at the other end of the line – in the Royal residence.

An adjoining room hosts a reconstruction of the radar screen room from the age Hack Green was employed as a radar station managed by the RAF. All panels are lit, providing a vivid, pure Cold War experience!

To the end of the main corridor, you can reach another entrance to the bunker, which is nowadays normally shut. However, this used to be the main entrance, and close to it are the control room of the bunker and the decontamination area.

The control room is not accessible, but the large windows allow to take a glance to its original appearance. It is still employed to control electric power and air conditioning. Manned nuclear-proof bunkers are customarily pressurized, sucking contaminated air from the outside, which is carefully filtered for poisons and radioactive particles, and pumping unfiltered bunker air to the outside (see this post for another example in a Soviet bunker).

People entering after work out in the fallout-polluted environment were decontaminated through showers, and used anti-radiation suits were left in an isolated sink still on display.

Before leaving the ground floor, you can find on the ground level the female dorm for the staff of the RGHQ bunker. In the same room, an original system for communicating on the very low frequency bandwidth has been put on display. This Cold War relic could be employed to issue orders to the strategic submarine force. This very cabinet was employed by Prime Minister Thatcher for ordering the attack against the Argentinian ship General Belgrano.

A final room on this floor is the sick bay, sized for the staff of Hack Green only, but equipped to manage health issues resulting from the exposition to a nuclear attack.

Underground floor

Descending to the underground floor is possible via the original stairs. The first room you meet features an exhibition of original Soviet uniforms, belonging to some high-ranking officials from various branches of the Red Army. Really hard to see in this part of the world, their origin is well documented.

Close by, is a small display of military material from the Soviet bloc, ranging from original weapons, to communication systems, emblems and instructional posters for the troops (similar to what you can find in dedicated museums in former Warsaw Pact Countries, like here or here).

Nearby is a communication room originally employed by the military staff of the bunker, working in parallel with civil servants in the management of the nuclear emergency. Original radio transmission gear of military standard is still in place.

Before entering the core preserved area of the bunker, i.e. the rooms of the RGHQ, you can find the original water and air supply systems, and the corresponding technical cabinets, in a big room on the underground level.

The rooms of the RGHQ are all interconnected, and located to the side of the corridor on the underground floor. The way they look is from the days of activity of Hack Green as a RGHQ, i.e. the 1980s. Typical Cold War technology from the time is featured in this area.

Firstly, you enter the warning room, which used to be the contact point of the RGHQ with the national surveillance system. By design, the BMEWS at Fylingdales should have picked up an incoming ICBM within 30 seconds from launch, spreading an alert signal at all levels. This would have been received here and by the entire civil defense system within 90 seconds. This would leave roughly 4 minutes (out of a total of around 6 minutes for the missile to come to Britain from the Eastern Bloc) to tell the population of the incoming missile, which would happen through some thousands sirens scattered around the UK. The physical alarm signal management system was called HANDEL, and was employed from the 1960s to 1992. The apparatus on display at Hack Green, a node of HANDEL, is notably still working, albeit disconnected.

The warning room can be accessed directly from the Commissioner’s room, both an office and private room. Original maps and furniture can be found in this room, the only private one in the bunker. Immediately next to it is the cipher office, a communication office connecting – at least in non-emergency conditions – the center with the external world. Ciphered language was employed for safe communication with governmental offices, both domestic and abroad.

Next are a conference room, for meeting within the staff of the RGHQ, and a broadcast studio. The latter was focused on radio broadcast instead of TV, since the latter would not work in case of a nuclear attack. The idea was for the Commissioner to communicate directly with the administrative region, possibly repeating messages of national significance, or instructing about local disaster recovery actions, evacuation operations, etc.

The tour goes on with a very interesting area, stuffed with original electronic and communication material. Communication from the bunker to the other similar bunkers withing the UKWMO was possible through a dedicated system called Emergency Communication Network (ECN). The main function was that of constantly updating the map of the fallout and of the operations taking place at all levels, including all surviving infrastructures. Many maps and teletypewriters, original components of the system, are part of the display.

The ‘brain’ of the system was the Message Switch Exchange (MSX). A top-tier system elaborated by British Telecom in the 1980s, it looks exceptionally complex. The lit cabinets and modules provide a really vivid impression of how it should have looked like back in the Cold War years. The electronic cabinets and wiring driving to the rooftop antenna are still lit as well.

A rare, incredible portable satellite communication antenna is on display. This was employed in peacetime condition, and stored inside the bunker when under attack.

The screens where the meteorologists and nuclear scientists displayed all the information gathered and prepared forecasts are another unusual Cold War sight.

Perhaps unexpectedly in a 1980s hi-tech environment, a purely analog, wired telephone exchange system is on display. This is original as well, and was kept in service as a ‘last line’ backup system within the ECN until 1992, should the futuristic MSX system fail under an attack.

A complement to the exhibition of the RGHQ is the fire control room, where a big screen and several communication consoles were employed for directing firefighting actions at a regional level. Following the experience of Nagasaki and the extensive nuclear tests of the 1950s, it is known that fires resulting from the extreme temperature and radiation intensity associated with a nuclear explosion are possibly even more dangerous to buildings and infrastructures than the shock-wave itself.

A display which is not original from Hack Green, but found an ideal home in this bunker, is made of a reconstructed room from the Regional Air Operation Center (UKRAOC), which would gather information from the BMEWS. The material on display used to be at RAF High Wycombe, where the UKRAOC facility was located in the Cold War years.

Fed by the BMEWS early warning station at Fylingdales, the apparatus in this room was constantly updated on the defense situation. A Soviet ICBM attack would be detected here, and from here the alarm signal to the entire national civil and military defense system would be triggered. This really one-of-a-kind reconstruction is really evoking, with the original panels all lit, and a dim light background!

A final room on the underground floor hosts a reconstruction of a Soviet missile launch room. Perhaps not accurate as a reconstruction, it is however centered on original material and memorabilia items from the Soviet bloc. This area has been employed as a set for movies.

At the base of a second stair well ascending to the ground floor you can find a reconstruction of one of the more than 1 thousand peripheral posts of the ROC. Such posts, scattered on the UK territory, gathered information for the RGHQ, and constituted the ‘sensors’ of the nuclear attack detection network. The technical gear includes over-pressure and radiation intensity transducers.

Getting there and visiting

The bunker is in a very secluded location, about 25 miles west of Stoke-on-Trent, and roughly 60 miles from Liverpool and Manchester. Very little advertised in the area, and not much known to the general public even in the UK, this hidden gem can be reached very conveniently by car, not much conveniently with public transport. The exact address is French Ln, Nantwich CW5 8BL, United Kingdom.

The bunker was built far from the crowds. Do not be worried as you see the road getting narrower and you feel like your NAV is taking you to nowhere – you are probably on the right path! Once there, you will find a large inside parking, and a top-level management of the entire facility.

Visiting is on a self-guided basis, with tons of explanatory panels and illustrations allowing to make the most out of your visit even if you have just a normal interest and preliminary knowledge of the topic. For a specialist, this super-interesting, one-of-a-kind site may require at least 2 hours for capturing the details, and possibly take pictures. Website with visiting information here.

York Cold War Bunker

Besides the impressive Minster and the beautiful historic town, York has the distinction of being the seat of one of the few Cold War bunkers preserved in the UK. Differently from Hack Green (see above), the bunker in York was installed relatively late in 1961, in the middle of the Cold War. Since then and until the collapse of the USSR, it acted as a node in the UK Warning and Monitoring Organization (UKWMO), collecting information and coordinating emergency actions around York in the event of a nuclear attack. A cluster of reporting points was linked to the bunker in York, which took the name of Headquarters of the N.20 Group within the UKWMO.

An eminently intelligence collection and information relay facility, the bunker was manned by the Royal Observation Corps (ROC), who provided voluntary civilian staff to support the monitoring and communication functions of the bunker in the UKWMO network. The bunker ceased operations and was basically sealed in 1991. Until that time, the ROC ran the facility, carrying out regularly scheduled drills and simulations. The bunker was designed and sized to offer its staff a self-support ability of a few weeks in a nuclear fallout scenario. Besides all supporting facilities, including water tanks, pumps and power generators, the facility was centered on a set of sensors for nuclear blast detection, as well as provision for fallout forecast and monitoring.

The bunker has been taken over by the English Heritage, a structured nationwide historical conservation association, which restored the site and opened it to the public.

The York Cold War Bunker is not far from the historical center, yet in a quiet residential area. Access is from a small parking area among low-rise buildings. The greenish paint of the concrete walls and the tall metal antenna on top cannot be spotted from much farther away than the parking itself. Curiously, the pedestrian door of the bunker stands some feet above the ground, and can be reached via a concrete stairway. Then once on top and inside, you need to descend some flights of stairs to get underground.

Compared to the Hack Green bunker, the York group headquarter is more cramped, with smaller rooms, lower ceilings and narrower corridors.

The first part of the visit covers the supporting facilities. These include a ventilation system, which as customary for nuclear-proof bunkers (but the same is true for older bunkers dating from WWII) filtered the incoming air and ejected the inside air, basically pressurizing the bunker environment with respect to the outside atmospheric pressure. This avoided passive ingestion of contaminated air from the outside.

A power generator and a water pumping system are also visible. A control panel for all the plants has been preserved, similar to the machinery in this area, dating from the time of construction.

The centerpiece of the visit is of course the reporting room. The reason for putting a headquarters in relatively low-sized York was the presence in the area of significant food production industries, as well as of a major railway node in Northern England. Furthermore, military facilities like the only BMEWS station in the UK happened to be in Fylingdales, northern Yorkshire. These features would make York a valuable strategic target for an attacking enemy. The main function of the bunker within the UKWMO was that of ascertaining the position and intensity of a nuclear explosion on the territory covered by its jurisdiction.

Anticipated by the early warning ballistic missile detection system protecting the UK, the hit could be recorded by the sensors available in the bunker or in other reporting points scattered around in the country. The bunker would then try to predict and follow the evolution of the fallout. This would allow coordinating emergency and recovery actions including fire suppression, medical evacuation, water and food transport and supply, etc.

The central reporting room looks mostly like an operations room in a military headquarter. It is structured on two levels, with large maps and boards for visually updating the situation and writing information. Batteries of telephones and teletypewriters allowed obtaining communications and sending updated information to allow emergency services as well as decision centers to carry out post-attack operations. This system was not dissimilar from the counterpart beyond the Iron Curtain (see for instance this center in Poland).

Nearby the reporting room, the components of the sensor suite allowing to detect the position and intensity of a nuclear explosion are on display.

The first is the bomb-power indicator (BPI). The working principle is that of reading the over-pressure caused by the shock-wave invariably produced by an explosion, and particularly intense for a nuclear explosion, releasing an immense amount of energy in a small volume and within a very short time. The supersonic traveling shock-wave is responsible for the mechanical breaking of building and superstructures, like antennas, suspended power lines, bridges, piers, etc. Being a wave of pressure, its intensity can be measured by pressure transducers, which for the BPI show the reading on a simple analog dial.

The transducer, seen handing from the ceiling in the exhibition, would stand on the rooftop of the bunker, exposed to the explosion. This type of sensor was also installed in smaller reporting points scattered over the territory of the UK.

A second sensor was the ground zero indicator (GZI). Here the working principle was also very simple. The main element in the GZI is a metal drum with a small hole in the side, and a piece of photographic paper covering the inside surface of the cylinder. An explosion would send a high-energy light beam through the hole, producing an impression on a precise point on the paper. By positioning in a very accurate way the drum on its pedestal on top of the bunker, according to a precise fine-tuning, it was possible to retrieve the direction of the incoming beam. By composing the reading of more than one precisely-located drum, it was possible to pinpoint the position of the explosion by triangulation, both in terms of geographical position and altitude. The latter is a very relevant practical information, since for instance the quality and hazard of the fallout are strongly related to the proximity of the explosion to the ground.

The GZI, a purely analog sensor, had the odd feature of requiring collection of the photographic paper by venturing outside of the bunker after and explosion, i.e. facing the fallout.

The third and most evolved system on display is an AWDREY computer. The name stands for Atomic Weapon Detection Recognition and Estimation of Yield. This artifact is very rare to see, and a quite refined piece of engineering for the time. It was supplied to 12 headquarter bunkers of the UKWMO, including York, and was operative from the early 1970s. The computer is the computational part of the system, whereas the detection system was based on a sophisticated transducer put outside, on top of the bunker. The working principle was much more sophisticated here, and related to the evolution of the intensity of the radiation coming from the core of the explosions in the first instants of the detonation process. Several stages of a nuclear explosions happen in a row on a scale of a few millionths of a second. These include a predictable oscillation of the intensity of radiation. The exact features of this oscillation are correlated to the yield of the explosion. The ability of AWDREY to collect and interpret data from the early stage of the explosion would allow it to reconstruct the position and yield of the explosion at once.

Tuned on experimental data from nuclear testing in the field, this system delivered good general performance, with some inaccuracy in case of intense atmospheric phenomena taking place – or during fireworks, when the York system was apparently misled in one occasion, interpreting it as a Soviet attack!

The tour is completed with a view of the dorm for the civil servants of the ROC, and with a short exhibition on some historical and political aspects of the Cold War.

Getting there and visiting

The York Cold War Bunker is professionally managed by the English Heritage. Visiting is only possible with a guide. Please note that as of 2022, pre-booking is strictly necessary, since there is no ticket office on site. The guided tour lasts about 45 minutes, including a well-crafted introductory video. At the time of writing, only the first underground floor is open for a visit, but plans for an expansion of the visible part of the facility are being drafted.

The tour is very interesting and detailed, with some educated humor to make it more enjoyable! For specialists, it will be too quick, especially if you like to take pictures. However, the site indeed deserves a careful look also for the more technically-minded people, especially considering the little number of similar facilities open in Europe – and of course in the UK, where it is a one-of-a-kind destination, and a true must for Cold War historians.

The location is about two miles west of York Minster. Convenient to reach by car, several public parking lots are available in front of the gate or in the neighborhood. The exact address is Monument Cl, Holgate, York YO24 4HT, United Kingdom. Website with full information here.

Hitler’s Mystery Mega-Structures in Central Europe

During the last two years of WWII, the Wehrmacht of Nazi Germany was slowly retreating from the eastern front, pushed back by the mighty blows of the Red Army. The bombing runs carried out by the western Allies from airfields in Britain were systematically hitting most urban centers in mainland Germany and over the territory occupied by the Nazis. It is hard to imagine, but it was in the year 1944, when the destiny of Germany was almost sealed, that industrial production in Hitler’s Third Reich reached an all-time record.

At that time the Germans were desperately short of fuel, raw materials and troops, and their production efforts would not spare them from a complete defeat in 1945. Yet it was in the last stages of the war that some of the most ambitious industrial facilities were designed, built and in some cases made operative before the end of the war.

The driver of the design was in most cases the need to move production lines to secluded and well protected areas, difficult to spot and to destroy through air bombing. As a result, these sites were placed far from urban centers. They were also designed to withstand bombing, by putting them underground, or building them with substantial reinforcement, making large use of one of Nazi Germany’s favorite materials – reinforced concrete.

In this chapter two major sites of this kind are described. One is in southwestern Poland, a region which had been part of the German Empire for long before WWII. The second is in eastern Bayern, today one of Federal Germany’s most prosperous states, close to the border with the Czech Republic. Photographs were taken in late summer 2018.

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Sights

Project ‘Riese’, Poland

Construction around this cluster of underground sites started in late 1943, and reportedly lasted until the closing stages of WWII, just days before the Soviets entered the region. The name ‘Riese’ means ‘giant’ in German, and it is surely well suited for this complex, which while far from finished is really striking in size. It was actually composed of at least six major construction sites, which in the intention of their designers should have been developed deeper in the mountains, until a link could be established between them forming a formidable network of tunnels and large halls.

Besides the size and historical meaning of these sites, what makes project ‘Riese’ so fascinating is also the actual purpose of this incredible complex is far from established. Three major theories exist in this respect. The complex might have been intended to be an underground industrial city, a kind of Noah’s Ark for the ‘superior race’ embodied by the top-ranking military and governmental staff of the Reich, or a gigantic secret laboratory for innovative technologies.

What is sure is that the construction was carried out by forced labor, mainly by prisoners of Gross-Rosen concentration camp, just a few miles north of the complex. For the scope, the Nazis created a number of satellite camps next to the entrance of the  construction sites. Rather incredibly, only very scant traces of the project remain in the written records of key figures of Nazi Germany – Albert Speer’s personal diary notably reports some millions marks allocated for project ‘Riese’, and at some point after the war he cited the item resulting from the completion of the construction works, whatever its purpose, as sized to be capable of hosting some tens of thousands people.

Today, six construction sites have been discovered, of which two – Osowka and Rzeczka, the most conspicuous – have been opened to the public, whereas the other are visitable basically for speleologists only.

Osowka

The first visitable site is in the town of Osowka. This site is composed of two parts, one underground with access from the side of a hill, the other close to the top of the same hill.

The underground part can be visited only with a guide. The plant of the completed construction features two accesses, and you will be driven in using the first and out using the other. Between the entrances, the site is mainly composed of an array of parallel tunnels pointing towards the mountain, connected by long halls.

Close to the entrance you can spot a concrete guardhouse with loopholes for machine guns. Some wooden structures like in a mine have been put in place to give an idea of the appearance of the working technique at the time of construction.

Most tunnels have been dug but not reinforced with concrete walls, whereas others are almost complete, showing a peculiar two-level design. The lower level features a smaller section, and the top one a taller, round shaped section.

A feature of the ‘Riese’ complex is a special technique for building the inner concrete coat of the rocky tunnels, producing the distinctive ‘church-ceiling-like’ appearance of some of the halls, with a round shape and frames close to one another.

The Osowka site features also a collection of smaller artifacts, collected from the ground and dating from the construction years, i.e. from late WWII.

Life-size silhouettes of some WWII tanks are on display, to show how the size of these items was totally compatible with the size of the tunnels, in support of a potential use of the site for weapon manufacture.

The outside part, which can be accessed freely, is the most mysterious. At the base of the trail leading uphill you can spot a strange concrete platform, with provision for – possibly – interred pipelines.

Close to the top of the hill you can find a huge concrete platform, with an apparently chaotic ensemble of slots, pipes, handles, stairs and pools. This item has been deemed close in shape to the base of a service building for the valves and pipelines of a power-plant. Theories have flourished in support of the use of this item as a prototype control system for a nuclear power-plant.

The nuclear program of the Nazis, which indeed existed and is even documented to some extent, is shrouded in mystery for what concerns the actual findings obtained during the war. These dark spots are also due to the destruction of most of the hardware connected with the program everywhere in Germany, and with the inherent secret nature of the program itself. No evidence exists of the Osowka site in the public papers about the nuclear studies of the Reich, so the true purpose of this object is likely to remain an unsolved riddle.

Close by this platform, you can find an original concrete building, part of the same construction plan. It is pretty long, with large windows, and likely intended for troops or technical staff.

Rzeczka

Compared to Osowka, this site is more centered on the inside part. Again, there are two entrances, close by a creek on the side of a hill, providing access to a network of tunnels. Similar to Osowka, close by the entrance you can find guard-houses in concrete. These were built soon, possibly for keeping a watch on the forced workers.

The construction works in Rzeczka were less advanced than those in Osowka. Yet thanks to the lack of the concrete coat, you can appreciate the size of the tunnels, some of which are really tall.

There are small collections of artifacts found in the tunnels, and an original concrete room offers a description of all discovered sites of the ‘Riese’ project.

A 1:1 copy of a V-1 German flying bomb has been placed in one of the tunnels, to show the compatibility of the size of this weapon with the tunnel. Such weapons were reportedly assembled in underground facilities elsewhere in Germany.

Visiting is again possible only with a guide. Some multi-media experiences with sounds, lights and voices are included in the tour, but these are not so impressive for those who don’t understand Polish.

On the outside, you can spot some relics from construction years, including trolleys, and concrete slabs watermarked with symbols of the local construction companies tasked with the practical realization of the site. There is also a copy of a V-2 rocket, operative in the last months of WWII but little effective in changing the fate of Nazi Germany.

Getting there and moving around

As pointed out, the sites connected with project ‘Riese’ are many, but most of them are not visitable unless to specialists and with the help of a speleologist. On the other hand, the two sites of Osowka and Rzeczka are professionally operated as primary tourist attractions. The distance from these two sites is about 20 minutes by car, so you can surely arrange the tour of both sites on the same day, with much spare time in your daily schedule.

At Osowka you can find a large parking and a fully equipped visitor center, where you can book a guided tour, or join a departing one – the only way to get inside. Please note that the number of people admitted on each tour is relatively small, so I would suggest booking at least one day in advance through their website (partly also in English) to be sure to get a place at the time you like. They offer several different tours. The most complete include a visit to a part of the underground site which can only be accessed by boat. This is given only on some days by reservation, and only for groups. The standard tour of the inside is offered several times a day.

The guided may turn out really boring, cause you are provided an audio-guide in English with explanations lasting a couple of minutes for each of the circa ten stops, in face of the Polish-speaking guide talking about 5 minutes per site. You may try to spend your spare time taking good pictures, but even though groups are relatively small, they tend to obstruct the view inside, leaving poor chances for acceptable shots. Furthermore, lighting is not very good, so a tripod would be recommended, except you don’t have the time and chance for undisturbed long poses. Therefore, if you are interested in top-level pictures, you would better arrange a dedicated tour out of the normal touristic offer. Otherwise, you’d better go prepared to a difficult visit.

The outside part of the site is less frequented and more rewarding. It can be reached in about ten minutes following a pretty steep, unpaved trail in the trees. This part is unfenced and unguarded.

The Rzeczka site has only an inside part, which can be visited only on a guided tour. You can join one of the frequent tours they provide even without reservation. There is a small visitor center and plenty of parking space. Similar to Osowka, the guide will speak in Polish, and you are provided an audio-guide in English. The visit lasts less than in the case of Osowka, and the audio-guide explanations are more proportionate to the speech of the Polish-speaking guide, making for a more enjoyable visit. The multi-media experiences are of little relevance for non Polish-speaking people. Outside you can find also some panels with explanations on the history of the site in both Polish and English. Website with some info in English here.

The tunnels in Rzeczka are poorly lighted too, so photographing will be difficult unless with a tripod, but the conditions are not very favorable for operating with a tripod – many people around and short times between stops along the tour.

‘Weingut I’ Aviation Industry Complex, Germany

The giant complex known as ‘Weingut I’, the original codename attributed by the Nazi staff at the time of its design and construction, is the direct result of a plan to relocate all major industrial production lines of the Reich to protected areas, far from the line of the front and from any major urban center. In this particular case, the new factory was intended to shelter the production line of the new Junkers Jumo 004 jet engines for the ‘Schwalbe’ – also known as Messerschmitt Me-262, this was the first jet fighter in the world to be pushed into service, back in 1944.

The huge factory was designed based on a basic module made of a reinforced concrete arch, some 250 ft open, 100 ft tall and 10 to 15 ft thick. This item was to be built on site and partly buried under ground level. Twelve such modules were needed for the complete hangar, with a total intended length of the factory of around 1.200 ft. Of the planned twelve sections, seven were actually built between mid-1944 and the end of the war.

Despite the intended scope was that of hiding the factory to protect it from aerial reconnaissance, due to the size of the construction works the object was reportedly spotted by US aircraft, but not attacked. Actually, the special construction was tested against explosives by the US Army after the war, resulting in the collapse of all modules except one, which is still standing today besides the pretty sizable relics of the others.

The site is not actively guarded, but it is located in a regional nature preserve, so access is through a nice walk in the trees. Once next to the hangar you can find multiple access points.

Close to the main arch, the only one still standing, it is possible to find an explanatory panel in German only. It commemorates also the forced laborers from the nearby concentration camps, who had to take part substantially in the construction works.

Walking under the arch is at your own risk, cause despite the bulky appearance of the structure, smaller pieces of concrete are hanging from from the ceiling. However, a walk inside will give you the most striking impression of the size of the hangar.

Just nearby the remaining module to the west you can find a walkable, half interred bunker, likely with a technical function which is today hard to imagine.

The module still standing today is the westernmost of the hangar, so walking east you will have the chance to step on the roof of the demolished modules. A number of thick iron rods can be spot at ground level.

Walking along the former southern side of the hangar, you can spot a deep well, probably part of the construction strategy. It may have been used to take out the gravel from beneath the base of the arches to lower them to a rest position on more compact ground.

Along the same side you can find a way to walk below the fallen structure. You can also get a view of the edge of one of the modules.

The eastern end of the complex is probably the most hazardous, cause you find an unprotected concrete cliff a good 10 ft high, constituted by the edge of a fallen module.

All in all, the place is a nice example of the undeniable structural design abilities of the German military, really interesting to visit both from a technical viewpoint and as a witness of the utopian visions of the Nazis, which unfortunately cost the lives of many.

Getting there and moving around

Reaching the trail-head is very easy by car. Leaving Mühldorf am Inn for Waldkraiburg along the road St2352, about 0.5 miles south of the crossing with St2550 you will find a sizable gravel factory to your right, preceded by an unpaved road taking west in the trees. You can park on the unpaved road on the northern side of the factory – probably a heir of the original factory built to feed the construction works of the hangar.

From there, you should take the unpaved trail into the trees, closed to vehicle traffic. It is another 0.5 miles to the site, on a flat and easy trail. A quick scan of the Google map will allow you to plan the trip. The place is not remote, cell phones work and you may use a virtual map to get oriented on site. Visiting might take about 2 hours for a very interested subject, including the trip from the parking and back, plus all time needed for pictures .

Wünsdorf – Nazi/Soviet Supreme Military Command

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For war historians and urban explorers Wünsdorf does not need any further presentation – a central place in the military history of the 20th century, famous for the many abandoned military buildings, from stately headquarters to interred bunkers. The name of this small town appears even in the very modern and interesting Military Museum of Dresden, where it is easy to find an original sign – in double alphabet – from the time when Wünsdorf hosted the Soviet military headquarters in the communist German Democratic Republic.

This report is based on photographs I took in spring 2017 in Zossen and Wünsdorf during a customized visit to the place I arranged with a local guide. For visiting information scroll down to the bottom of the page.

History – in brief

The small town of Wünsdorf, about 15 miles south of Berlin, has a serious military tradition, dating back at least to the beginning of the 20th century. At that time a large military complex with many barracks was set up by the order of the German Kaiser Wilhelm II – a central player in WWI – in the neighbor town of Zossen.

To this ‘Belle Époque’ era belongs part of the housing still in place today, as well as some of the largest and most aesthetically pleasant buildings in town. Among them, a former training camp for athletes of the army, and some big command buildings.

Following the dawn of the Nazi era, the place gained further relevance, with the institution of the German Supreme Command of the Armed Forces, also known as ‘Oberkommando der Wehrmacht’, or ‘OKW’ in brief. This was presided by general Wilhelm Keitel for all the duration of WWII, and represented the ‘top of the pyramid’ in terms of military decisions, as general Keitel reported directly to Hitler.

The staff of the OKW could be accommodated in purpose-built bunkers here, designed to withstand severe air bombing action, as well as to be disguised as normal country houses from above. These were known as the ‘Maybach bunkers’.

Besides bunkers for housing military personnel, a large communication bunker, known as ‘Zeppelin bunker’, was built to the purpose of connecting the brain of all military operations with the various divisions scattered over Europe and fighting on more war fronts.

When WWII finally came to an end, the Soviets captured the region, and that was the onset of a full new chapter in the history of the town. The reference name ‘Zossen’ was dropped in favor of ‘Wünsdorf’. The area of the two villages was totally cut-off by a 17 km wall, guarded with a top security level. Inside, housing for around 40,000 staff was prepared in subsequent stages, adding many purely Soviet-style residential buildings to what was still in place from before and during the Nazi era.

The supreme command of all Soviet forces in the occupied territory of Germany – to become the German Democratic Republic, or ‘GDR’, in 1949 – was installed here. All four branches of the Soviet armed forces had their respective headquarters in a corresponding sector of the ‘prohibited citadel’, with inner walls dividing the four areas. These headquarters controlled more than 200,000 troops stationed in the GDR until the early Nineties.

The Soviets tried to blow up the Maybach bunkers, with some success, and also the Zeppelin bunker, with no success. They developed it into an nuclear-proof installation, and added two further bunkers, for controlling military operations – including all air patrolling ones – in real time over the territory of the GDR, and along the crucial border with the Federal Republic and the Western world. Similarly to WWII, once again Wünsdorf was the main stage of crucial decisions for the full span of the Cold War.

The year 1989 marked the beginning of the end for this military town, with the reunification of the GDR with the Federal Republic and the end of the Cold War. All Soviet forces stationed in Germany – about 500,000 people, including troops and their families -, soon to become Russian forces in 1993 with the collapse of the communist regime in the USSR, began a well-coordinated retreat back to their mother Country, leaving Wünsdorf in September 1994.

Since then, the huge housing is largely uninhabited – the current population having dropped to about 4,000 – and the stately buildings built by the order of the Kaiser are deserted. Nonetheless, differently from other former military bases left to nature or converted into something else, the regional government of Brandenburg has formally taken over the property, which is not totally abandoned, nor in an irreversible state of disrepair, with the aim of selling it or transforming it into a museum.

Up to now, the place is still in the hands of the regional government, and specialized tours can be arranged with a local society of enthusiasts.

Sights

This site is really huge, with countless remains and interesting places to see. My visit took just about 5.5 hours, I think you would really need 1 day – and possibly more – to cover all features with enough time to both learn about the history and take good pictures of everything interesting! Here I will present a mainly pictorial description of the part of the complex I had the chance to visit this time. I think another day I will need to go back and complete the visit!

You may get an impression of the town from above, from this report based on aerial pictures taken during a dedicated flight over the region.

Officers’ House

This is probably the most famous non-bunker building in the complex. It dates back to the early 20th century – the place was the headquarter of a sports training ground established by the Kaiser’s army before WWI. In the Thirties, German athletes were trained here for the 1936 Olympic Games in Berlin. During WWII this became a command building for the OKW, while in Soviet times it was actually transformed into a house for higher ranking staff of the supreme Soviet command, with living rooms and entertainment facilities.

The main building faces an almost square park, where a huge statue of Lenin was installed and is still standing.

Inside the main building it is possible to find clear traces of the original ‘Belle Époque’ architecture.

The inside of the building was spoiled of all furniture – the Russians reportedly tried to sell everything to the German government when they left, but the offer gained little interest. Only little part of the furniture, clearly from the age of the Kaiser, can be still spotted. Among the highlights of the bottom floor, there are two murals, in a typically Soviet naïve style, and a sculptured wall. Somebody is trying to put together Soviet memorabilia in a small museum, but all presented stuff is not original from here.

On the first floor, a very interesting industry-themed mural and a 20-ft long curved view of Moscow can be found in a corridor. In a completely dark room on the same floor, where once a small memorial museum about the Great Patriotic War – WWII for the Russians – was standing, the retreating Russian forces left one of the few remaining written messages, concerned with the atrocities of the Nazi regime – for the guide this was possibly a subliminal memento for the German People… In the same totally dark room it is possible to find a big, finely sculptured wall.

To the back of the main building it is possible to find a modern addition by the Soviets, a cylindrical building once hosting a diorama of the battle of Berlin. The diorama was transferred in the village of Zhukovo, halfway between Kaluga and Moscow, in the westernmost part of Russia, when the Russians left.

The two wings to the back of the Officers’ House host two highlights of the show. In the southern wing it is possible to find an empty swimming pool, dating from the days when the place was a sports training ground, with little changes, which include the showers and the diving board, built by the Soviets. The construction technique was very good, and the pool was operated until 1993-94 reportedly with little updates.

In the northern wing it is possible to find a theatre. This is a bit creepy, for it is totally dark – electric power was cut off years ago – but everything, including the curtain over the stage, is in place like a performance was about to begin! The Soviet past of the place is clear here thanks to the decoration of the medallion over the stage, resembling the monument of the Soviet Soldier in Treptower Park, Berlin. In the roomy foyer it is possible to see the numbered hangers still in place!

The White House

Across the road from the Officers’ House it is possible to see another early 20th century building, used as a command building by the Soviets during the Cold War, and affectionately called ‘The White House’, both for its primary role in imparting orders and for the colonnade gracing the front façade. The building is inaccessible, and still property of the regional government.

Nearby, a former house for officers dating from before WWII is now operated as a local city hall.

Today, some of the many immigrants coming from Africa to Europe are being hosted in a building close to the White House by the German Government.

Soviet Railway Station, Bread Factory and Soviet Housing

Due to its great strategic relevance in the Cold War era, the prohibited town of Wünsdorf was daily connected two-ways with Moscow. The last train to Moscow left in September 1994. The railway station of Wünsdorf-Waldstadt today operates on a local railway, with trains mainly to and from downtown Berlin. The old Soviet terminal and some warehouses nearby have been abandoned and are in a state of total disrepair.

Close by the station, it is possible to find an abandoned and unattractive small factory with a tall chimney. This is where literally tons of bread were produced every single day since the Nazi era and up to 1994 – reaching 25 tons per day when the place was most crowded in Soviet times. The building was considered a strategic asset by the Nazi, who built it with a 60 cm reinforced concrete roof able to withstand air bombing.

Whilst not very crowded, today some houses from the early days in the village of Zossen have been nicely restored to their original conditions. Unfortunately, they still share the roadside with some abandoned or not refurbished Soviet buildings, keeping the typical ‘Soviet ghost’ aura alive in the town.

Maybach Bunkers

Two complexes of peculiar bunkers were built in the Thirties – Maybach I and II – for housing staff of the OKW. From the distance and from above, these half-interred bunkers had the appearance of large farm houses. In reality, they were designed to be bomb-proof, and when they were blown-up by the Soviets after WWII they did not collapse completely.

One of the two Maybach complexes is very close to the fenced area where the Soviets had their three interred bunkers.

Zeppelin Bunker

This communication bunker was built under the Nazi more than 60 feet deep into the terrain. It was made of layers of land and concrete, making it extremely durable and difficult to destroy. As a matter of fact, the Soviets tried to blow it up after the Potsdam conference in summer 1945, but they didn’t succeed at all. They decided to re-use it, sealing part of it to withstand a nuclear attack – including airlocks, reinforced doors, showers for decontamination, and sleeping quarters for troops trapped in by radioactive fallout. When leaving in the Nineties, Russian troops took home all technical rigs, stripping the bunker almost completely of any technical hardware.

Among the highlights in the Zeppelin bunker there are the sealed main entrance built by the Soviets and the decontamination facilities.

Going down it is possible to appreciate the size of the German design, with tens of rooms, long and roomy corridors and staircases. A small exhibition is dedicated to communication hardware from the Nazi and Soviet times. Copies of the Nazi schemes of the communication network from here to the Eastern front allow to understand the proportions of the system.

One of two long tunnels – the longest is about 600 ft! – was turned into a sleeping quarter for troops isolated in case of nuclear attack, and original berths are still visible today. Another corridor was so long it was used as a rifle range!

The bunker was powered by diesel engines – originally submarine engines under German ownership. These are gone today, but the smell of diesel fuel is still very marked in their room. It’s hard to imagine how noisy this place had to be! Some of the Soviet fuel tanks and air conditioning piping are still there, with original technical schemes.

A lift was added by the Soviets – it’s not working any more. On the bottom level there are water pumps and other supply systems. Normally this area cannot be toured, also due to water flooding problems.

In a small wing of the bunker it is possible to see the effect of the Soviet attempt to blow-up the bunker. The dynamics of the attempt are not clear – what explosive was used and where it was positioned. A pierce in the steel/concrete armored ceiling and a cracked reinforced concrete pillar are the only visible results. The size of the crater in the ceiling suggests much explosive was used, but the damage around is fairly limited and very localized. A feature of many military buildings occupied by the Soviets, signatures and graffitis in cyrillic alphabet can be found on some concrete walls of the bunker.

Soviet Half-Interred Bunkers

Really close to the entrance of the Zeppelin bunker, it is possible to find the way into two other less visible facilities.

One of them is a small communication bunker of simple construction. This is basically straight, with a round shaped cross-section. The corridor leading to the main part of the building is rather narrow and pointing down to the underground. The main part is much roomier, with curved steel frames making the walls and ceiling. This was used also as a training facility. This bunker was totally stripped by the retreating Russian troops.

The second bunker is much more articulated. It was codenamed ‘Nickel’, and the Soviet construction type is UK-20. This was a communication and control bunker for military operations, in particular for air operations. Even though this bunker was stripped similarly to the other two, some technical rigs and tons of paperwork can be spotted in the semi-dark environment of this installation.

Technical plants include the original water pumping system and several high voltage cabinets.

The room where the air control center was is lighted. It is very big, and copies of the original schemes help to understand how the setup was. Everything there was taken back to Russia by retreating Russian army.

Other interesting items include propaganda posters from Soviet times – they always look very exotic!

Garrison Museum & Red Army Museum

In the old pre-WWI stables two really unmissable small museums have been prepared. I would recommend visiting them after the site itself, to better understand the relevance and usefulness of the exhibition.

The first is centered on the history of the garrison in Zossen from the years when the barracks were built, and it documents the history of the Officers’ House and all other pre-Soviet buildings around. A focus is given also to the Nazi period, with many photographs and memorabilia. All panels are unfortunately in German only, but the pictures speak for themselves.

The second collection is dedicated to the Soviet period. Here you can find memorabilia from all stages of the Cold War era, including both museum items already preserved by the Soviets in a museum previously existing in Berlin-Karlshorst, but also everyday items and stuff from Wünsdorf.

Among the many panels, a small insight dedicated to the huge nuclear base in Vogelsang, covered in this other post of mine.

Headquarters of the Soviet Air Force

Besides the building of the society running the guided tours of the place, it is possible to find the abandoned headquarters of the Soviet Air Force. A modern statue of a pilot is standing ahead of an Asian restaurant, whereas the main building is inaccessible. A statue of Lenin – not easily visible from the street – can be found in the vegetation, ahead of the main façade. To the side of the building it is possible to find a typical Soviet memorial.

Much More…!

Among the other uncommon things you can find around in Wünsdorf, there are some Winkel-type air raid shelters, 19 of which were built in the Nazi period for military staff. Most of them were blown by the Soviets, and some of the 7 (?) remaining ones are preserved today.

Visiting

As reported, this ensemble is huge and well looked after. Technically speaking, it is not abandoned – at least the most interesting parts of it. Parts – like the Officers’ House – are awaiting for somebody to own them, parts are destined to remain tourist attractions – like the bunkers and museums. For these reasons, to make your visit practical and enjoyable, and for making the best of your time, I strongly suggest contacting a guide.

Actually the local society also in charge of the nice and interesting book selling activity, for which ‘Bücherstadt Wünsdorf’ – ‘Wünsdorf the Town of Books’ – is famous, runs guided tours on a regular schedule. Full information also in English from their website here. Besides the pre-scheduled tours, some longer special-themed tours can be booked in advance. If you are visiting – like me – from abroad, then I suggest taking contact with the guide before going there.

When I visited, I arranged with the guide a ‘double-tour’ in English just for me, asking to merge two of the tours offered with pre-booking. This was not a cheap alternative – I had to pay alone the price intended for two group tours, but all in all that was worth the financial effort! – but above all I must say I regret not having had more time!

The guide is nice and extremely knowledgeable, he speaks a perfect English and Russian as well. He knows anything from the history of the place, including interesting anecdotes and technical notions. He will take you to all places of interest with a minivan, and of course he will give you all the time for taking pictures, including some with a tripod in especially dark conditions – he has two portable lights for helping in the task! So the guided tour will not be boring at all.

After that, you may like to go back to have a look to the exterior of some buildings you had not the time to check out during the guided visit.

The towns of Wünsdorf and Zossen are basically a single entity, but possibly not on your nav. In case you get confused when driving to the building where you should meet the guide, just follow the signs for the book selling activities – the building is the same.

I mentioned there is a railway station, and of course you may choose to come in by train and move by bicycle – walking would be too time consuming in my view, due to the distance between points of interests. Coming by car is also very practical if you are not moving by train on your trip, and there is room for parking almost everywhere.

 

 

STASI Prisons and Headquarters in Berlin and the GDR

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Among the most unequivocal signs of the oppressive communist dictatorship in the former German Democratic Republic – ‘GDR’ or ‘DDR’ in German – are probably the many buildings once operated by the STASI, the German cousin of the well-known Soviet KGB.

Being a state security service by its very name – STASI stands for ‘STAat SIcherheit’, or state security -, this organization was responsible for the capillary control over the behavior of the citizens of the GDR, to the aim of counteracting any threat to the communist rule. It was mainly composed of a para-military staff and of an extensive network of informers – so extensive that actually about 1 out of 180 in Eastern Germany worked for the STASI, while by comparison in the USSR 1 out of 595 worked for the KGB. The main goal of this agency was keeping the statu quo, hence any suspect behavior of East-German citizens, deemed subversive with respect to the communist rule, was reported, investigated and usually suppressed.

People found guilty of acts against the State – i.e. against the communist government – were often sentenced to years of imprisonment. This meant that prisons and camps flourished in the GDR, as people got arrested and at least kept for interrogation just for having received western newspapers or having colored their rooms with posters of American pop singers. How the STASI came to know of similar ‘violations’ was by means of informers, who triggered secret investigations carried out with ‘James Bond gear’, like cameras and microphones hidden in coat buttons and bags. Microphones and cameras were also usually installed in the walls, chandeliers and doors of the houses of suspected subjects.

This huge institution was among the most feared and hated – as well as expensive to run – in the GDR, and soon after the reopening of the border and the demolition of the wall in Berlin in 1989 many of its buildings were occupied by the population. To deny responsibility in the unfair trial, imprisonment and confinement of many citizens, the staff of the STASI began ‘burning’ its archives immediately, but they were so extensive that this rapidly turned out to be impossible. The STASI was disbanded among the first governmental agencies of the GDR in the early months of 1990, even before the two halves of Germany were merged. Finally the archives were made publicly available during the process of the German reunification. Many people came to know they had been carefully observed and spied in every movement during their everyday life.

Today, some of the most prominent buildings once operated by the STASI are open to the public and represent an interesting and worrying memento of this chapter of the history of Germany. The following photographs are from some such sites I visited over the years from 2013 to 2023.

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STASI Headquarters, Berlin-Lichtenberg

The headquarters of the STASI occupied an extensive citadel composed of many big, multi-storey buildings. Like the KGB, the tasks of the STASI weren’t limited to internal state security, but also to border protection – a very serious business in Eastern Germany, as you can see from another page of this site dedicated to the German inner border – and espionage activities abroad. The various directorates occupied their respective buildings in the citadel. The place is in a semi-peripheral district of former East Berlin named Lichtenberg.

The main building hosts a museum of central relevance on the topic, where you can find much data about the history and the impressive size of this agency, as well as spy gear – for instance mimetic microphones for listening to conversations in private houses. The stories of some of the victims of the communist surveillance machine are also reported. Envelope-opening devices and rags for preserving the odor of those arrested for watchdogs are displayed in showcases.

Probably the highlight of the museum is the apartment and office of Erich Mielke, the director of the STASI from 1957 – well before the wall was erected in Berlin – up to the dissolution of the GDR. Many original directional offices have been preserved and nowadays can be visited.

The place is very evocative and retains much of the disturbing ‘GDR atmosphere’, typical to this and other similar installations. The number of visitors is much lower than close to Checkpoint Charlie and the DDR museum near the Berliner Dom, which are mostly cheesy tourist attractions with comparatively little content. On the contrary, in this museum you can still easily perceive the commitment of the GDR goverment towards its own survival, and the proportion of the oppressive apparatus that was created to this aim – here you clearly understand the STASI was a serious business and changed the life of many people.

After visiting the museum in the central building you may have a look around to the exterior of other buildings in the citadel, today mostly unused, abandoned or partially occupied by private businesses – I guess the place still retains for many people a very negative aura.

Getting there and moving around

Today the citadel can be reached very conveniently by car or with the U5 (between the stops Magdalenen Strasse and Frankfurter Allee). The museum is fairly modern and well presented, but as of 2015 when I visited the ticket could be paid only cash and some explanations were in German only. Inside the museum there is no air conditioning, and it can be very hot and uncomfortable in summer. Parking is not a problem in front of the main entrance or nearby. Website here.

STASI Prison and Restricted Area, Berlin-Hohenschönhausen

The second largest quarters of the STASI are located in yet another outer district of former East Berlin. Old photographs of the area clearly show that this part of the town was interdicted to visitors not connected with the business of the STASI – there used to be fences and gates all around, cutting some of the roads entering the district. Besides some directorates and administrative buildings, this citadel hosted a prison and a labor camp. The former was the main STASI prison in East Berlin, and those who were arrested on account of suspect activities against the State were usually carried here, where they had to withstand interrogations.

This place is really grim and appalling. It looks like the staff of the prison had just left. Everything from what you see to the smell of the cells, offices and interrogation rooms is totally evocative of the original GDR atmosphere.

The STASI became the owner of the place in 1951, after the Soviets, who had managed the occupied territory directly after the German capitulation in 1945, left control of many administrative functions following the creation of the GDR. Under the Soviet rule, in the years of Stalin between 1945 and 1951, a labor camp was set up here and the main building of the prison – a former canteen for Nazi staff – opened for business. More than 20’000 people passed through this installation between 1945 and 1951, many of them on their way to deportation to the USSR.

Under the control of the STASI, the camp was dedicated to non-political prisoners, where the prison, enlarged in more instances as the STASI citadel was growing up, was for the ‘enemies of the State’. More than 20’000 people were imprisoned here between 1951 and 1990.

The place can be visited only on guided tours, offered on a regular basis also in English. Following the tour you can see various imprisonment cells. The worst – and really inhumane – from the times of the Soviets are in the basement of the main building, with no windows and no ventilation, where many people were crushed together waiting for interrogation or deportation.

The majority of the cells date from the era of the GDR, and are more modern. As the main business of the prison was that of extorting confessions, the prisoners were progressively brought in a state of psychological prostration. Preventing any form of communication was part of the treatment, so most cells for newly arrested people were for one person only. To isolate those arrested even more, when moving from the cell to the interrogation rooms and back the wardens observed special red and green lights, telling when there was somebody else in the corridors. This way the inmate would not see anybody except for the warden and the officer who interrogated him during all his or her stay in the prison.

Padded cells with straitjackets like in asylums were used in the process of extorting confessions, when the inmates were treated with drugs causing hallucinations and loss of physical control. These can be seen in the basement of one of the buildings.

Also visible are some cells with open top for spending half a hour per day in open air.

An interesting item presented in the exhibition is a minivan that was used for taking people quietly to the prison. The appearance and markings are those of a normal cargo van for transporting goods, whereas the interior is structured with micro-cells for arrested people.

Interrogation rooms are aligned on a corridor, and are extremely essential, featuring a shabby furniture. Greasy traces on the wallpaper and the smell of old fake leather heated by the sun is make the original atmosphere come alive.

A further wing is where a clinic for inmates was located. The clinic was of good level, with much technical instrumentation to manage several regular or emergency situations. The office of the director of this wing is another example of pure East German design. Most notably, the once omnipotent Erich Mielke appears to have been interned here following his arrest after 1989.

A one-of-a-kind exhibit is a railway truck for inmates. Besides the rather uncomfortable compartment design, with small chairs in a very little space, this transport was made really inhumane through the lack of air conditioning, the windows with bars and even a white glass, which deliberately created disorientation. These trains were artificially put on the lowest priority, so as to make traveling a painstaking experience for inmates.

The memorial is not central, so only those really interested in the history of the GDR, and of East Berlin and the STASI usually come here. Nonetheless, it is managed like a good level international museum, with guided tours, facilities for groups and a serious bookshop. Before taking the tour you are offered a movie telling the history of the prison in brief and showing the testimonies of former inmates. All in all a very interesting – and instructive – experience, surely worth a detour from the more touristic districts.

After visiting the prison, you may have a look around to the other buildings in this citadel. You can find a map in a cheap but interesting booklet they sell in the bookshop (‘The prohibited district’, by Erler and Knabe).

Getting there and moving around

The correct address of the prison building is Genslerstraße 66, Berlin. You can reach it easily by car. The neighborhood is primarily residential and not central, so parking won’t be a problem. If you have not a car, you can arrive conveniently with the tram line M5 from the most central districts. The correct stop is Werneuchener Strasse, and from there it’s about 0.4 miles to the gate of the prison. Website here.

STASI Prison Lindenstrasse, Potsdam

Behind an elegant façade like many others you can find in central Potsdam there is a prison comparable in size to the ‘main’ prison in Berlin Hohenschönhausen described above, and mostly unknown to the general public crowding this small and beautiful historical town.

This building was used as a prison by the Kaiser, the Nazis, the Soviets and finally the GDR. It was renovated and modified in many stages during its long history, and during WWII under the Nazi rule, some sections of the courthouse in central Berlin were transferred here, when the original buildings of the Nazi courthouse got damaged as a result of Allied air raids.

Differently from Hohenschönhausen, the prison in Potsdam is not part of a ‘citadel’, even though the KGB headquarters in the GDR were not far – actually they can be found close to Schloss Cecilienhof, Potsdam, now partly converted to luxury apartments and villas.

Another difference with respect to Hohenschönhausen is the style of the building, which dates back to older times. This is reflected in the plan and in many details of the construction, which at least from the exterior is very elegant.

Inside you can find Soviet cells in the basement – also here the most inhumane – and other cells packed along narrow corridors on several floors. In the inner courtyard there is a central block of open top cells for ‘recreation’, and traces of the original cameras and surveillance systems.

Something you may appreciate is the fact that you can visit the place on your own. Paneling with data or telling the stories of former inmates are totally in German, but you are given a leaflet with explanations and a map of the place at the entrance. Also a few original interrogation rooms have been preserved and can be seen.

The entry price is very reduced, so visiting is of course a must for the committed tourist, and interesting also for the general public. The place is ‘mimetic’ and not much advertised, so you won’t find the usual flocks of visitors, unlike the royal estates in Potsdam… Much recommended.

Getting there and moving around

The precise address is Lindenstrasse 54, Potsdam. It is in central Potsdam, so you may park at your convenience for visiting the district and have a stop there if you like. Similarly, if you are coming with the public transport system just go to the central district and walk to the place. Website here.

STASI Pre-Trial Prison, Rostock

Similarly to the prison in Potsdam, the anonymity of the façade of this building in central Rostock, placed to the back of a section of the courthouse still working today, is really deceiving. A prison capable of hosting more than 100 inmates can be reached today via a small door leading mainly to the offices of the faculty of the local university. Once inside the building you will notice a worrying fence on the side of the stairs going to the first floor, where you can get access to the prison.

Besides the many cells, it is possible to find a very interesting exhibition on the history of the GDR and of the STASI, with much data and stories from the time. Also many artifacts can be found, like spy gear, rags for preserving the odor of inmates for watchdogs to make capture easier, state bonds used to pay informers, and more.

The main function of the prison was that of keeping those arrested for interrogation until they were sentenced. More than 4000 people spent some time in this prison, mainly for ideological crimes, in the years of the GDR.

The place can be visited for free with an audio guide also in English. Some parts, including the open-top cells outside and the rigor cells in the basement can be visited only in a guided tour – as far as I understood, these are offered in German only.

On the top floor you can see an interesting exhibition on people who escaped or tried to flee the GDR by sea.

Getting there and moving around

Centrally located in Rostock – a lively city on the coast of the Baltic Sea – at a walking distance from Rosengarten. If you are moving by car, you can park on Hermannstrasse, and reach the door to the back of the courthouse block (opposite a small market). The door is heavy, so press it hard, it may be open even if it looks closed. Website here.

STASI Maximum Security Prison ‘Bautzen II’, Bautzen

Originally designed as a pre-trial and short-term court jail by the local government, the prison of Bautzen II was erected under the Kaiser to the back of the courthouse in the homonym town in the southeastern corner of Saxony, today very close to the border with both Poland and the Czech Republic. A larger penitentiary, named Bautzen I and originally conceived as a juvenile jail, was built around the same time in town.

With the advent of the Nazi dictatorship, both facilities began to be exploited for the prosecution of political dissidents, or to isolate elements of ‘inferior races’. Violence, intimidation and extorted confessions began to be the rule. Both branches of the prison of Bautzen fell under Stalin’s control at the end of WWII, and this corresponded to an exceptional increase in the number of inmates, which included a substantial share of former Nazi staff and opponents of the Soviet regime.

After the creation of the GDR, the facilities in Bautzen went on working as primary centers for the confinement of political prisoners, together making for possibly the largest detention center in the country. The smaller jail of Bautzen II, with slightly more than 200 single cells, was turned into a maximum security prison intended for the most dangerous ‘subversive elements’ of the whole state. While Bautzen I is still an active state prison of todays Federal Germany, Bautzen II has been opened to the public as a memorial.

The dreary access from outside is through three gates, and this adds to the perception of the place as really ‘no hope’.

Similarly to the prison in Potsdam (see above), Bautzen II can be toured on a self-guided basis, without a group. Most parts of the prison are opened, and several cells can be accessed.

Some of the cells retain the original furniture, even shabbier than the usual communist standard. The metal staircase in the middle of the prison building allows to better appreciate the size.

Besides rigor cells with additional bars and an incredibly small walkable area, some groups of cells are separated from others, with armored doors splitting the corridors in contiguous isolated sections. This was possibly a special feature of this maximum security prison. You can experience an unreal silence when sitting in a cell closing both the doors of the corridor and of the cell.

There are also some ‘common areas’ for inmates to work and stay, and an external courtyard divided in sectors, to allow inmates to spend some time open air, but without the chance to meet or see each other.

Getting there and moving around

The prison of Bautzen II is open as a national monument, a website with full information about visiting is here. I noticed that there are descriptions in German only throughout the prison, so you would better go prepared at least on the history of the place – starting for instance from the website – to get the most from your visit. The location is Waigangstrasse 8a, which is behind the courthouse of Bautzen, 0.8 miles to the east of the historical town center, conveniently reachable walking from the railway station and also by car. The area around the courthouse is mainly residential and parking can be found easily. Bautzen I is still today an active regular detention facility and cannot be visited.

A vital center of the Sorbs, an etnic group of Saxony and Brandenburg recognized by the German Federal Government, the town of Bautzen is nice to visit and rich of historical content. It is about 45 miles east of Dresden, and bolsters a picturesque, perfectly refurbished town center with medieval to baroque architectural elements.

STASI Headquarters, Dresden

The STASI headquarters and prison in Dresden have been developed starting 1945, originally as a prison for the Soviet NKVD (later KGB), on the premises of a former factory not far from the river Elbe and the historical district of the town – which would lay destroyed for decades following air raids in WWII. Similar to the prison in Lindenstrasse, Potsdam (see above), the underground floor of the former factory building was turned into a prison, with provision for a number of very basic cells typical to Stalin’s era, aligned on a narrow corridor.

Until the facility was handed over to the newly-formed GDR in 1952, the Soviets interned here mostly German citizens accused of cooperation with the defunct Nazi regime, as well as subversive elements, unfriendly with the Soviet controlling forces. As usual within a dictatorship, indictment was largely arbitrary and sentences extremely harsh – following arrest, most people were deported to forced labor camps of the Gulag system in the USSR, some were brought to Moscow to be hanged, and many were sent to provisional camps established in the ‘Soviet occupation zone’, later to become the territory of the GDR.

In this part of the exhibition it is possible to step in most of the cells, very small and essential.

A room is dedicated to the Gulag system, whereas another is a memorial for those taken to the Dresden prison and who reportedly did not survive the ordeal of the Soviet detention system, or where sentenced to death on the base of political reasons.

Also visible are some service rooms, like the bathrooms and rooms for the guards.

Along the corridor an emergency cable could be pressed by the guards at any time when in distress, triggering an alarm. From this part of the prison it was possible to access a inner courtyard.

Concurrently with the handing-over to the STASI, the facility was expanded, with offices and a modern multi-storey prison building.

Access for those arrested was via an inconspicuous wooden gate. An apparently innocent cargo van was employed for arrests. It can be checked out and it reveals provision for several segregated micro-cells inside. Once disembarked from the van, some prisoners may have had to wait for the prison check-in process inside mini-cells. Temperature in this area used to be – and still is – terribly hot in the summer.

Once inside, prisoners had to undress and undergo an accurate inspection in the check-in room. They were photographed for records in a special room, where they sat on a chair which was moved by the camera operator to obtain portraits at specific angles. Then prisoners were assigned dresses and slippers for their stay.

This prison acted as a remand (i.e. pre-trial) prison, with 44 cells on 4 levels.

Cells were for one, two or three people. Single cells were not customary from the 1970s on, except for rigor cells.

An example of the latter can be seen, with a small chair bolted to the ground and no windows. A special cell was that for writing letters, something that was possible only at prescribed intervals (e.g. once per week) and in this special room – obviously, all communications were checked and censored by the STASI. This cell features a small table, a chair, and a lavatory.

An uncommonly ‘comfortable’ cell was employed for foreign prisoners, who included those who had tried to help GDR citizens in their escape attempt, and who for some reason had got caught by the STASI. These cells had a window allowing a view of the sky – not possible through the special windows of regular cells – and a larger iron bed, instead of a narrow wooden berth.

Separated boxes in a walled courtyard outside were employed for letting the prisoners spend some minutes per day in the open air.

Walking the prison building you may notice that most of it is still original, including the purely-GDR linoleum floor, and the alarm system. The heavy curtains make the building dark and oppressing. The temperature in the summer is also very hot. The building is very silent, much resembling the original asylum-like feeling.

A routine operation in a remand prison was interrogation of the prisoners. Prisoners were insistently interrogated by STASI staff before formalizing an indictment. For the purpose, they were taken to the top floor of the building, along a few flights of stairs, up to the the interrogation rooms. Interestingly, the door giving access to this ‘bureaucratic’ part of the facility still bear seals (now reopened), put in the days of the revolution following the demolition of the wall in Berlin in 1989. The offices of the STASI, with material and archives, were sealed for criminal investigation.

Today, in this area a few original relics from the STASI operations can be found, like photographic film, nominal folders, stamps, keys, etc.

One interrogation room is still visible, whereas many others have been converted and are today employed for thematic workshops by the organization running the memorial.

As of 2023, the memorial is undergoing restoration, with the reopening of a larger part of the offices planned soon. Momentarily, it is possible to see the original grand auditorium of the STASI, a full-scale theater, with a typical GDR decor and even an original audiovisual apparatus. It is hard to imagine what kind of people could attend some symposium in an elegant room like this, just 50 ft away from prisoners confined in cells, non-criminals confined mostly only because suspected of having some arbitrarily-defined ‘subversive ideas’.

The quarters of the old NKVD prison are linked to the more modern prison building by a long underground corridor.

Getting there and moving around

The former STASI headquarter in Dresden is run as a memorial by a very active society, supported by various preservation bodies and associations. A professional website with much information, including a leaflet with a description of your visit in English, can be found here. A visit may easily take 1.5-2 hours for an interested subject. Many parts of the facility are accurately preserved and make for a very evocative memento. Furthermore, permanent and temporary exhibitions add to the experience and documentary value.

Visiting is possible on a self-guided basis, with explanatory booklets in many languages including English lent for the duration of your visit.

The memorial is located northeast of the historical district of Dresden, right on the northern bank of the river Elbe. The exact address is Bautzner Straße 112a, 01099 Dresden. However, access by car to the inside parking is possible only at these coordinates, (51.06688926262786, 13.782718227181237). Since access is from a major road where a U-turn is impossible, and the entrance to the parking is somewhat ahead of the official address, it is worth employing these coordinates for your nav, otherwise you might be missing the entrance to the parking, being forced to a pretty long tour of ‘one ways’ and ‘no turns’ before you get back to your intended destination.

Memorial ‘In der Runden Ecke’ – STASI Headquarters, Leipzig

Similar to its cousin in Berlin-Lichtenberg, the former headquarters of the STASI in Leipzig has been opened as a memorial. In this case, the building was not made on purpose, but converted from a pre-existing one. A decorated, elegant palace in the city center was chosen for the local brain of the repressive apparatus. The building features an angled facade, since the name ‘on the round corner’ – ‘in der Runden Ecke’ in German.

The entrance hall to the former headquarters has retained much of its original appearance.

The main part of the exhibition is immediately reached through the original reception office, which has been left willingly untouched since the pre-1989 era – including now dead CC-cameras, and two elaborated majolica murals with emblems of the STASI and some decorations.

The exhibition takes the ground floor of a wing of the building, i.e. only a small part of the original site. The office of a clerk has been mothballed preserving at most its original, shabby appearance, with a portrait of Honecker.

In an adjacent room, many rigs for covert mail and communication interception and inspection activities are displayed. These range from steam-pumping envelope openers, to fake postal stamps from Federal Germany, or even from abroad (to send false communications), and even fancier machines for reproducing signatures, looking inside parcels, etc. – every design betraying a really paranoid attention to details, and a true waste of exceptional engineering abilities.

A complete cell and photo studio – for mugshots – from the now demolished STASI prison in Leipzig has been spared for this exhibition, not much dissimilar from others on this web page (see above).

More artifacts on display include audio and image gathering stuff, ranging from micro cameras and recorders, to exceptionally compact, high-precision zoom lenses. Archived rags with the smell of repression victims in case of escape – for dogs – are another specimen from the STASI crazy inventory.

A room is devoted to the STASI huge paper archive, and to the silly, titanic effort to destroy the evidence of years of illegal spying activity as quick as possible, following the re-opening of the border. The solidified slime obtained from paper fragments is on display. Some very evocative pictures show the immense Leipzig archive and its conspicuous remains after the destruction attempt.

Two more rooms tell about the immediate post-WWII history in Leipzig, with pictures from 1945 with Nazi officials who committed suicide, as well as from the first stage of Allied occupation and Soviet administration – before the GDR was founded.

An interesting collection of artifacts concerning the Soviet-GDR friendship and alliance is really evocative of a luckily bygone era.

Finally, the corridor is full of interesting pictures, telling about the disinformation role of the STASI, border patrolling, and many other businesses this overpowered criminal organization was in charge of.

The building is today also seat for an agency managing the old STASI archive for historical purposes. Furthermore, the first floor and the elegant stairs leading to the top can be toured, with some display cases showing attractive Soviet-era artifacts.

The first floor in particular must have been an official meeting/reception area, or a director’s office. Part of the original furniture is still there, including a mural with the head of Dzerzhinsky, the founder of the Soviet Ceka back in Lenin’s time, and an inspirational figure for all fanatics of ‘state security’ in the communist world – an activity which was a synonym for violent prosecution of free will.

Getting there and moving around

The memorial is on the border of the pedestrian area in Leipzig city center. It is modestly publicized, but thanks to its accessibility, it might be easily included in a standard visit to historical Leipzig, and it is significantly populated by tourists. Entrance is free of charge, and its professional website is here. Despite the small size, for an interested subject visiting might take 2 hours or more. Free pictures are allowed, and an audio guide in English allows to get much from the visit even for people not speaking German.

STASI Bunker, Machern

The bunker in Machern is an underground facility built for the STASI in 1968-72 as an emergency headquarter, for keeping the chain of command and coordinate operations in case of a potential crisis. It represents a specimen of the level of commitment of the GDR government with respect to the preservation of control, and a witness of the huge budget made available to this particular ministry, inextricably linked to the government itself and pivotal in the survival of the oppressive GDR communist regime over its entire life span.

The crisis in Prague in 1968 possibly triggered the build up of a similar underground network by the STASI, which customarily operated in secrecy. The very existence of the bunker, located some 30 minutes driving from central Leipzig, was unknown to most. The inconspicuous visible part of the facility was deceived in one of the lots in a district of free-time homes for employees of a public company. It was discovered only following the 1989 revolution and the abolition of the STASI.

Compared to underground military installations, either of the NVA or the Red Army, the bunker is rather compact. However, it had provisions for about 100 staff in case of crisis, with a moderate ability to resist military-level attacks, including facing a nuclear war scenario.

The visit starts by accessing the grounds, where an unassuming little country villa of the GDR can be found, which acts as a check-in point, and as a ticket office.

Soon you may notice the presence of unusual gear on the premises. These include houses and training gear for dogs, cables for allowing leashed watchdogs along a pre-assigned watch pattern, a concrete sentry box, fire extinguishing gear, piles of fuel barrels, a deck for repairing vehicles, and a rather big grey hangar.

The latter hides the blast-proof double entrance to the underground bunker. Before stepping in however, it is possible to check out an impressive amount of spare parts aligned on shelves, with literally tons of interesting military-grade material – most of them clearly marked as Soviet manufacture. Many mystery boxes with writing in Russian can be seen. Rolls of barbed wire, metal nets, camo blankets, and other material for sealing and deception can be seen together with more technical material, including technical instrumentation.

A small collection of memorabilia from the STASI years is shown on site, as well as a permanent exhibition with technical schemes and organization details.

Access to the underground bunker is via a horizontal armored door and through a long flight of stairs. An airlock with two tight doors was installed for making the place blast-proof and seal it in case of nuclear attack.

Dosimeters and showers for decontamination can be found close to the entrances – there are two of them, both inside the same hangar.

The bunker was mainly intended as an intelligence center for crisis management. The flow information was guaranteed by a number of communication systems and facilities. Manned stations can still be seen in a number.

Beside communication facilities, the bunker features sleeping quarters for the STASI staff, a kitchen/canteen area, and a few offices and private quarters for the decision-makers – senior STASI officers. These offices offer a reasonable level of comfort, typical to the the bunkers from the era (see for instance Kossa and the Polish headquarters near Wolin, but a similar level of comfort could be encountered also on the western side of the Iron Curtain, like here in Britain).

The bunker is built mainly around a square corridor, with an array of long and narrow rooms, each dedicated to a specific function.

Soviet material can be found everywhere, including air filters and heaters.

Different from the previous sites bound to the grim and disturbing history of the STASI and of the communist-led repression in the GDR, this bunker offers an interesting perspective into the para-military domestic activity of this former backbone of the single-party government of that country.

Getting there and moving around

The STASI bunker-museum in Machern is a branch of the STASI memorial in Leipzig (see above).  An updated web page on this bunker can be found in the German version of the website of the Leipzig memorial (here), with updated information on the planned dates for a visit. The bunker is regularly open only on a few dates over the year, which are published in advance.

The visit allows to access the grounds, where explanatory panels are available in German, as well as the storage hangar and bunker. In the hangar, visitors are offered a short introductory video (in German). Afterwards, it is possible to visit the hangar and the bunker on a self-guided basis. Reservation is not required, but access is regulated on site by gathering visitors to form small groups, who are admitted to the bunker one by one to avoid overcrowding. Time in the bunker is more than enough to check-out the items on display, taking all the pictures. In all, a visit to this installation may take about 1 hour once on site.

Please note that they accept only cash for the ticket.

The location is in the countryside, about 10 miles northeast of Leipzig along the road B6. It is easy to reach only with a car or similar. There is a large parking there (51.376119908957726, 12.633996194227596), also serving the nature recreation area around. The entrance to the bunker can be reached from the parking with a .5 miles walk along a local road here (51.37857212168658, 12.644452664748663). No parking is possible on that road. Please note that the position corresponding to the bunker marked on Google Maps is largely inaccurate.

The bunker is located very close to the former Soviet base of Brandis/Waldpolenz (see here).

KGB Prison and Headquarters, Potsdam

This memorial is strictly speaking an outlier in this chapter, since it was never a STASI facility. Since their arrival in late April 1945, the Soviets installed a major intelligence and counter-intelligence center in Potsdam. An entire district was severed from the rest of this fashionable imperial town – which had fallen in the hands of the Soviets and later in the GDR. Its perimeter was fenced, the area provided with a guarded gate, and interdicted to everybody except authorized Soviet staff.

In it there were residential buildings, as well as central offices of the secret intelligence and security services of the Soviet Union in the heart of the GDR, and immediately on the border with West Berlin.

Today this exclusive residential area has been returned to its original function, except for a memorial, which has been prepared in the former prison originally built by the Soviets in a pre-existing, relatively little and unassuming building.

The Soviet secret services employed the prison from 1945 to the early 1950s as a remand prison for former Nazi collaborators, but also for German citizens considered dangerous or unreliable for the Soviet system. They were typically sentenced to years of forced labors and deported to the Gulag systems. When the STASI was created and took over the surveillance of GDR citizens, this prison was employed primarily for Soviet citizens considered as dissidents, including military staff. It is estimated that the Soviet population in the GDR totalled half million people in the late 1980s, therefore surveillance was not an easy task for the Soviets, requiring a dedicate apparatus with its own facilities.

The citadel and the prison in it went on operating until 1994, among the latest facilities to be relinquished by the then-Russian government.

The largely arbitrary indictment and sentencing of German citizens interned in this prison by the inhumane bureaucratic Soviet government of the years of Stalin indeed made many victims. Therefore, this place is primarily a memorial.

The shabbiness of the entire construction, typical to Soviet KGB prisons (see for instance here) is really striking. The visits starts on the first floor, where a number of cells can be seen. A rigor cell can be recognized by the lack of any light or ventilation. The ground was typically flooded with cold water, and the walls are covered in rough plaster, so that the prisoner could not sit on the ground nor lean against the wall.

On the top floor, former interrogation rooms today host a very interesting exhibition, with rich and detailed information in multiple languages including Russian and English. They cover the activity of Soviet secret services in the ‘Soviet occupation zone’, and later in the GDR and the Soviet enclaves in it. The brutal treatment reserved to many Germans, typically in the immediate post-WWII years under Stalin’s rule, is witnessed through striking documents, accounts and photographs. Among those sentenced to death were even schoolboys who did not want to learn Russian.

A focus is put on the structure of the law system of the communist dictatorship in the USSR, as well as on the mechanism of interrogations – including accounts of Soviet defectors.

Original memorabilia from the place include coats, special armbands for the staff authorized to enter the citadel, as well as original documents from the various ages of operation of the place.

In the basement are group cells intended for many people on their way to deportation. Graffiti from inmates can still be seen in the plaster.

A rigor cell which did not allow standing is also part of the exhibition.

A memorial to the victims of Soviet hardship has been installed on a side wall, whereas a modern visitor center completes the exhibition.

A thematic walk in the former Soviet citadel highlights through explanatory panels the original function of some of these buildings. Now returned to their original imperial splendor, they carry unsuspected grim memories of the communist era. Among the most notable features is the relic of a former small monument. Looking carefully, some of the houses still bear numbers on the facade according to the Soviet-style numbering of town blocks.

Getting there and moving around

The memorial is called Gedenk‑ und Begegnungsstätte Leistikowstraße Potsdam, and its professionally-run website is here. The address is Leistikowstraße 1 – 14469 Potsdam. Many parking opportunities on site. Reaching is easy also with public transport from Berlin. The prison is very close to the Cecilienhof palace.

The visit is on a self-guided basis, with much information available through the website, including options for smartphone-guided tour to the prison and to the former citadel. The permanent exhibition (in many languages) is rich and interesting, a detailed visit to the prison and exhibition may take up to 1 hour 15 minutes. A walk in the former Soviet citadel, today very enjoyable, may add 30-40 minutes for the more committed visitor.