An abandoned theme park in East-Berlin:
http://www.flickr.com/photos/breakdennis/sets/72157605233495983/

This guy had also created a very good photo-stream of an abandoned hospital:

http://www.flickr.com/photos/breakdennis/sets/72157604830680529/

and about the Olympic village from 1936:
http://www.flickr.com/photos/breakdennis/sets/72157604423658488/

and some more abandoned places:
http://www.flickr.com/photos/breakdennis/sets/