For over 50 years, the white radomes of the Teufelsberg have been one of Berlin's most prominent landmarks. For half of this time the city lay over 100 miles behind an 'Iron Curtain' that divided East from West, and was surrounded by communist East Germany and the densest concentration of Warsaw Pact military forces in Europe. From the vantage point high on the Teufelsberg, British and American personnel constantly monitored the electronic emissions...