Have to admit to having a weakness for abandoned amusement parks. There is just something so profoundly surreal about them and the eerie feeling that you have been there!
Spreepark from Wiki.
There is also a group pool on Flickr.
Dead Dinosaur from naomi.
riesenrad by ill phil
and these two by urbtravel who has lots of images of other abandonements.
And a video from twoblueberries.