The Teufelsberg had risen to 115m, with a level, irregular-shaped summit accessed by an unsurfaced, winding track from the Teufelseechaussee. From 1970 until 1984, some of the terraces supported a vineyard for the production of Wilmersdorfer Teufelsstropfchen or Wilmersdorf’s Devil’s Drop. This chapter presents a detailed functional description of a Cold War intelligence-gathering centre, operational at the height of the Cold War. By characterising the buildings and reading significance and functionality into all spaces that comprise the Teufelsberg, a clear picture has emerged of process, information flow, operational connections and divisions and the distinction between social and operational space, US and British space and space occupied by offices, industrial scale computing and for social and professional interaction. The study also revealed some icons of Cold War myth and reality: two-way mirrors, Faraday cages and the shredding and pulping of primary data.