Tempelhof Airport, Berlin

This was basically East Berlin's local airport. It is now defunct but it appears to be used for other functions, like offices and events. You can ride or walk around the buildings and onto the old tarmac. Communist architecture is so scary looking. This is one of the big big buildings from that era left, but you can cruise around it and image how the rest of the city would have ended up looking if Hitler's architect, Speer had his way with the whole town.