So, History channel ran a show called Life After people with scientists theorizing what would happen to the remnants of our civilization after we are gone. I must say it was really interesting. I wouldn't say they are completely accurate, but if was still pretty cool.
My favorite part was what they think will happen to skyscrapers after I think 50 years. Basically they become vertical ecosystems made up of smaller animals and plants. They figured things like mice would move in for protection and food, followed closely by the descendants of house cats.
http://www.history.com/minisites/life_after_peopleIf you can find it, I'd suggest watching it. I wouldn't say it is worth the $20 they are asking for it on their site though. I guess they have be running it multiple times though.
My wife got mad at me as the first thing I was thinking of was a D&D capaign.
Later,
Glenn