I've always been fascinated by modern dystopias. I think the world's slums are probably the ultimate dystopias but there are also some more advanced buildings that have a "Bladerunner" atmosphere. The Kowloon Walled City (dismantled in 1993) was a prime example.
The Ponte Tower in Johannesburg also seems like a modern dystopia:
Full set here:
http://thechive.com/2012/04/11/if-yo...ife-15-photos/
What other dystopian buildings or neighborhoods do you know?