Nice topic - I like it too.

There's one place which I'm quite fascinated about, which just recently has become a minor focus in the media (there was even an article in A-magasinet today), it's the Lier mental hospital. It's a centre of attention because it's also reportedly haunted and is regularly visited by many urban explorers and ghost hunters. Eight buildings in the hospital are still used, but the remaining three were closed in 1985-86. Unfortunately there is a discussion going on if they're going to demolish the abandoned buildings or not. Anyways, I got to check it out sometime because it's not very far from where I live.

Here is a site with some more info and pictures, but you'll probably need google translate

http://gamle-lier-mentalsykehus.piczo.com/?g=1&cr=5

The former embassy of the Iraq in the DDR: http://einestages.spiegel.de/static/topicalbumbackground/6921/die_geisterbotscha- ft_von_berlin.html

Until now I had no time to look closer to this page, but youshall find good pictures there: http://www.deadmalls.com/

Checkout this abandoned building CCF http://www.therealwaverlyhills.com/

I haven't got much, but here are two road stubs. They're for proposed extensions of the Seaford-Oyster Bay Expressway.
http://commons.wikimedia.org/wiki/File:NY135stubend.JPG

http://commons.wikimedia.org/wiki/File:South_NY_135_Stub-Exit_1E.jpg

Were it not for anti-highway zealotry, the road would've actually reached Oyster Bay. Not only that, it would've gone from Wantagh State Parkway towards Jones Beach, to a never built bridge across the Long Island Sound.
http://www.nycroads.com/roads/NY-135/
http://www.nycroads.com/crossings/oysterbay-rye/

Here's the abandoned Kings Park Psychiatric Center, part of which is in the Nissequogue River State Park:
http://www.lioddities.com/Asylums/Kings_Park/index.html

And some other abandones places on Long Island:
http://www.lioddities.com/Abandoned/index.html

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/

Oh my gosh! Neptune, you're back!!

There’s a abandoned asphalt road that still leads into Wilmington. The surrounding foliage has almost taken it over. Some parts of it can still be seen. Like where South 17 (Part of 421) merges into 74/76. Picture below. Whenever I take this route, every once in a while I’ll look to see if its still there. These snapshots are from google maps.



It was cut in half when 421 was built (or so I’m told) On the other side the road continues onward to the Cape Fear river where it ultimately stops. The USS North Carolina Memorial Road merges into it. Another picture below.

Tanks, ships and planes underwater at Saipan:
http://www.spiegel.de/wissenschaft/mensch/0,1518,565651,00.html

A bunker found after 63 years at the Danish beach:
http://www.spiegel.de/wissenschaft/mensch/0,1518,563021,00.html