It was such an interesting story for me about this hill that I thought I'll share this with you all. A friend of mine that recorded this video was telling me about this spy station. The most interesting thing about it as he said is the fact that inside the biggest antenna dome the acoustics are really scary. so much echo, you can't understand what the person 2meters next to you is saying. http://en.wikipedia.org/wiki/Teufelsberg
Anyone has more info about this? I'm more interested to hear about how did they find a place where all frequencies come together to one point. You could hear Der Dritte Raum playing from Tresor.
http://www.youtube.com/watch?v=JMxlEyprrL0
Berlin Teufelsberg
I recommend this short documentary which is quite informative.
http://www.palladiumboots.ie/exploration/berlin
http://www.palladiumboots.ie/exploration/berlin