Teufelsberg, Berlin. Abandoned American NSA spy station

Teufelsberg Radar Station, Berlin. The US National Security Agency (NSA) built one of its largest listening stations on top of the hill, rumored to be part of the global ECHELON intelligence gathering network. The hill was located in the British sector. Mobile Allied listening units would drive to different locales in West Berlin hoping to gain the best vantage point for listening to Soviet and East German military traffic. One such unit drove to the top of Teufelsberg and discovered a marked