Of course everyone knows about Pripyat

Lots of fun things on i09

http://io9.com/the-most-dangerous-modern-ruins-for-thrillseekers-and-u-1513260646

The seedy cyberpunk underworld.

This popped up on reddit today. really awesome set of images. 

http://www.reddit.com/r/Cyberpunk/comments/1uawhr/real_life_cyberpunk_places/

Here is the link to the album http://imgur.com/a/a0Tu6