Remains of the Berlin Wall. A fence was put up around it to prevent people from chipping it away and taking it home. A fence around a wall... kind of funny. Also, notice the black round thing at the top of the wall. At first, people were able to jump up and get a grip on the edge of the wall and use it to pull themselves over. So the roundness was added to allow no possible grippage. (This was in the early stages before the more developed security... the mine fields, dogs, guards, etc.)