The story of the NSA listening post – told by an ex-SIGINT analyst who worked there. Once upon a time, or during the Cold War, the U.S. National Security Agency (NSA) built a man-made mountain of rubble over the top of an underground Nazi technical college in Berlin. This massive hill was called Devil’s Mountain, or Teufelsberg in German. It was on Devil’s Mountain where the NSA built one of the largest and highly classified Listening Stations in the world to eavesdrop and spy, intercepting Soviet, East German and other countries’ communications. This NSA Listening Station of Radar Domes on “The Hill,” was rumored to be a part of the global ECHELON intelligence gathering network.
Of all the NSA's Cold War listening posts, their intelligence facility on top of Berlin's Teufelsberg was their most secretive.