The Teufelsberg (German for "Devil's Mountain") is a hill in Berlin, Germany, in the Grunewald locality of former West Berlin. Rising to 120 metres Berlin's Teufelsberg is not only Berlin's highest point, but also a place steeped in history. The US National Security Agency (NSA) built one of its largest listening stations on top of the hill, rumored to be part of the global ECHELON intelligence gathering network. Since the withdrawal of the military in 1999, the buildings stand empty. Our calendar shows the increasing decay and the return of nature. Calvendo calendars are premium products - a bit more pricey than others but with added benefits: Our calendars always look beautiful on your wall because we produce them locally with premium paper and sophisticated spiral binding, ensuring easy turning of pages and flat hanging against the wall. A protective transparent plastic cover sheet provides added stability. Treat yourself to a Calvendo calendar and you get something that looks better all year round.