Teufelsberg is a mountain and a place charged with history. During the Nazi period, the shell of the Military Technology Faculty building was here. It was blown up after the war and 25 million cubic meters of Berlin rubble was piled up here. And this is how the Teufelsberg, which gets its name from the nearby Teufelssee lake and is actually two hills, became one of the highest points in Berlin at 114.7 meters like the Arkenberge and the Muggelberge of course. The Americans began to use the hill as a listening post in the 50s. Today of Teufelsberg remains some of the installation with five large radar domes covered with countless graffitis.