Teufelsberg
Viewpoint · Berlin
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Teufelsberg is a rubble hill built from Berlin's WWII debris, piled over an unfinished Nazi military college and rising to 120 metres, one of the city's highest points. From 1963 the US and UK ran Field Station Berlin here, a Cold War listening post that fed the global ECHELON network. Abandoned after 1990, its domes are now covered in street art, and the summit gives a panoramic view over the Grunewald canopy to the skyline.
From Wikipedia
Teufelsberg (German: [ˈtɔʏfl̩sbɛʁk] ; German for Devil's Hill) is a non-natural hill in Berlin, Germany, in the Grunewald locality of former West Berlin. It rises about 80 metres (260 ft) above the surrounding Teltow plateau and 120.1 metres (394 ft) above the sea level, in the north of Berlin's Grunewald Forest. It was named after the Teufelssee (Devil's Lake) in its southerly vicinity. The hill is made of debris and rubble, and covers an unfinished Nazi military-technical college (Wehrtechnische Fakultät). During the Cold War, there was a U.S. listening station on the hill, Field Station Berlin. The site of the former field station is now fenced off and is currently being managed by an organisation which charges 12 euros for public access.