- Teufelsseechaussee 10, 14193 Berlin Germany
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The US National Security Agency (NSA) built one of its largest listening stations atop the hill, rumored to be part of the global ECHELON intelligence gathering network. "The Hill", as it was known colloquially by the many American soldiers who worked there.
The site is currently fenced off and manned by guards. Organised guided visits were possible until 1 September 2015. Now an artists playground and comune. Visits to view the graffiti art and gain access to the domes are still possible. Note that the site is not maintained to high safety standards (although better than when it was un-managed). The site and building has uneven surfaces and broken glass and building debris. Accessing the main dome involves ascending a pitch dark stairwell in the centre of the building. Entry is currently €15 payable at the main entrance gate.
More informations can be found here