The Flak Tower at the Humboldthain park is one of three anti aircraft towers that were commissioned by Adolf Hitler in 1941 to protect the city centre of Berlin from aerial bombardment. There were not only canons on top of the tower but also a bunker underneath that could hold up to 15.000 people. After the war the bomb-proof building was blown up in large parts by the French and turned into a pile of rubble. Over 50 years later the Berlin Underworlds Association managed to make the remaining ruin save for entry and its now open to the public. If you go there you can either climb on top of the towers and enjoy the view over the city, or if you are prepared to get dirty you can even go inside with one of the guided tours.
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