Just outside of Berlin stands the Teufelsberg - or Devil's Mountain-an artificial hill made of millions of pounds of rubble from wartime Berlin (at the very bottom lies Albert Speer's unfinished technical college). After the war ended, the National Security Agency (NSA)built a series of buildings and geodesic radar domes atop the 280-foot high hill, in order to monitor Soviet activity. It was decommissioned after the Berlin Wall fell, though the ruins still stand today.
