Back in the times of the Cold War, the US Army had it‘s main radar field station on top of Berlin‘s artificial „mountain“ known as Teufelsberg (devil‘s mountain). It has been closed for a while now, but since the follow-up real-estate projects have all failed, the area has been opened to the public two weeks ago.
So the area has been invaded by the hackers and a lot of interesting information on this is coming up. Until then, you might want to enjoy some nice QuickTime VR panorama pictures of the site that Fiedel has put up on his web server. Be warned, access will be slow as the server is behind a private DSL line.