25 October 2012 Last updated at 19:45 ET
A Soviet missile base in Germany that spy planes never saw
It was top-secret in 1959 and remains almost completely unknown to this day - the first Soviet nuclear missile base outside the USSR. But it is still there, crumbling and steadily being reclaimed by nature in the forests north of Berlin.
link-
http://www.bbc.co.uk/news/magazine-20079147