Teufelsberg
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Teufelsberg (German for Devil's Mountain) is a hill in Berlin, Germany, in former West Berlin. It rises about 80 meters above the surrounding Brandenburg plain, more precisely the north of Berlin's Grunewald forest.
It is an artificial hill with a curious history: it was built by the Allies after the Second World War from the rubble of Berlin during the following twenty years as the city was rebuilt. One estimate for the amount of rubble is about 12 million cubic meters, or about 400 000 buildings.
Teufelsberg's origin does not in itself make Teufelsberg unique, as there are many similar man-made rubble mounds in Germany and other war-torn cities of Europe. The curiousness begins with what is buried underneath the hill: a Nazi military-technical college designed by Albert Speer. The Allies tried using explosives to demolish the school, but it was so sturdy that covering it with debris turned out to be easier.
In the 1960s a small skiing center was built on the slopes of the hill.
The curiousness does not end here: The US National Security Agency (NSA) built one of its largest listening stations on top of the hill, rumoured to be part of the global ECHELON intelligence gathering network. At the request of US government, the ski lifts were removed because they allegedly disturbed the signals. The station continued to operate until the fall of East Germany and the Berlin Wall, but after that the station was closed and the equipment removed. The buildings and radar domes still remain in place.
During the NSA Operations some other curious things happened: It was noticed that during certain times the reception of the radiosignals was better than during the rest of the year. The 'culprit' was found after a while: it was the Ferris wheel of the annual German-American Festival on the Hüttenweg in Zehlendorf. From then on, the Ferris wheel was left standing for some time after the festival was over. There were also rumors that the Americans had excavated a shaft down into the ruins beneath, but that could never be proven. Most likely it was an underground escape tunnel.
As of 1990s as Berlin had an economical boom after the German Reunification, a group of investors bought the hill from the City of Berlin and started to build hotels and apartments at the top, possibly preserving the listening station as a spy museum. The building boom of Berlin overproduced, however, and the Teufelsberg project became unprofitable, and the building project was aborted. As of early 2000s, there has been talk of the city buying back the hill. Unfortunately it seems that the site has been vandalized heavily since the company abandoned the project.
