, Teufelsseechaussee
Berlin, Germany
Do Depending on your date, this is either super-exciting, risky, fence-hopping, abandoned-building exploring or slightly lame but still cool enough Trespassing Lite.

Yes, you have to find a hole in the fence, but the site is full of tourists, even little old ladies.

Here's some info from the Facebook page. Again, a photo would really be key here: "Its origin does not in itself make Teufelsberg unique, as there are many similar man-made rubble mounds in Germany. The curiousness begins with what is buried underneath the hill: the never completed Nazi military-technical college (Wehrtechnische Fakult├Ąt) designed by Albert Speer.