http://algebraoflife.blogspot.com/2007/ ... first.html
Some very Giger/Alien-like design, wouldn't like to be alone when the lights go out...
[img]http://img401.imageshack.us/img401/9666/sewerjm2.jpg[/img]
EDIT: Just stumbled upon these photos too of the...'deep dark regions under Russian streets'
http://www.funmansion.com/html/Underground-City.html
http://www.funmansion.com/cool_pictures ... City_1.jpg