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Tour 2 – From Flak Towers to Mountains of Debris Explore the devastated ruins of a WW2 fortress

Fuehrungen -- Tour 2 Pano

In 1940, Hitler ordered the construction of six anti-aircraft, or “Flak” towers to defend Berlin from enemy aircraft. Of these six, only three were built, and after the war they were “demilitarized” – or blown up, however the Flak tower in Humboldthain park in Gesundbrunnen was only partially destroyed.

Since April 2004 we have been leading groups through the interior of the tower. On this fascinating tour, visitors will be shown three of the seven floors of one of the biggest bunkers in the city. Here a dazzling underground landscape awaits – complete with dizzying views into the depths of the building. In addition, our guides present in-depth information about the history of the structure and the still on-going project to clean it up. To date, members of the Berlin Underworlds Association have spent a total of over 8,000 hours removing over 1,400 cubic metres of rubble – and have created in the process ideal sleeping quarters for bats. Therefore, so as not to disturb their hibernation and unnecessarily frighten our guests, we only offer this tour from April to the end of October.

For more detailed information about the Flak Tower, please take a look at Flakturm Humboldthain (in German language only).

Special Advices and Equipment 

All participants must be at least 18 years of age.

Sturdy footwear is obligatory (no sandals or flip-flops!) and warm clothing is recommended – the interior temperature is never more than 10°C, even in summer. Safety helmets, provided by the association, have to be worn throughout the duration of the tour.

Status: 19.05.17 Top
Dates (Tours in English) 

April 1st to October 31st:

  • Thursday – Tuesday at 11 a.m.

On Sunday, May 21st the tour at 11 a.m. has to be canceled.

  • additional tours around national holidays are displayed in the calendar

The tour schedule is subject to change.
NO TOURS: 2017, June 17th & 18th
Please use the calendar function on the left hand side of the page to display which tours are taking place.

The times for tours in other languages can be seen by visiting their respective pages, or via the calendar function.


Approx. 90 mins


11 € (reduced 9 €)


Tickets are available in the pavilion next to the south entrance of the Gesundbrunnen underground station (in front of ‘Kaufland’), Brunnenstraße 105, 13355 Berlin (exit direction to Humboldthain Park, Brunnenstraße).

Opening hours

Reservations are not possible and tickets may only be purchased on the day of the tour.
Please arrive early in order to buy them – expect lines on busy days.
We only take cash as payment, credit/bank cards are not accepted!


Meeting point (with valid tickets only) 

Brunnenstr. 105 – southern entrance-hall of the subway station Gesundbrunnen (exit direction to Humboldthain Park, Brunnenstraße), next to our ticket sales-pavillon.


Public transportation 

U8 Underground Railway Gesundbrunnen, S 1, S 2, 25, S 41, S 42 (S-Bahn, City-Railway, National Railway) Gesundbrunnen, Bus 247


Until further notice this tour is not available for groups in English.