There are some beautiful photographs on the site. Thanks Spuck.
I've long been fascinated with old buildings. I would love to be one of those explorers. I did get to be one at the old abandoned town hotel...it was accessible through the back of the bar where I worked and we would sneak back there and give 'tours' occasionally. My town has since come to its senses and that beautiful old building is now our public library, with a rentable ballroom for events.
So I thought I'd mention this site...which I peruse from time to time. It's kind of a dream site for me...both in that I want to explore these places and also because many of my good dreams involve exploring room after room of interesting places:
http://opacity.us/