Abandoned tunnels and vast underground spaces.

[Oneslowz28]

This is pretty cool.

http://www.cracktwo.com/2009/07/abandoned-tunnels-vast-underground-spaces/

http://www.cracktwo.com/wp-content/uploads/2009/07/c25.jpg

http://www.cracktwo.com/wp-content/uploads/2009/07/c4.jpg

[d_stilgar]

There's a really great fake Half-life 3 screenshot made with an image from that flood system. I knew it was fake because I had seen some of these images before. I hate it when people fake like that.

+rep. Love these shots.

[luciusad2004]

I always wanted to do urban exploring but im to afraid to do it. Don't feel like going to jail for tresspasing or getting killed by angry hobo's / gangs.