I have been to deadmalls site but had forgot about it till I clicked on the link thanks!
I bet the old subways are cool to check out we just dont have those in Fl they call them indoor pools here.
I found another site one time that was around chicago or new york and one place was a old police station and there was till ammo cans and all kinds of stuff just wasting away down inside that place.
I went to a abandoned college one time didnt know what it was till later and they had a indoor pool full of green water and things moving in there was straight out of a horror movie.
Found out later there was a fire there that destroyed most of the campus and killed a bunch of people and it was never able to recover from it. During the last bad hurricane season they tell me most of what was left collapsed.
In jacksonville Fl there is public school #4 I think it is that sits abandoned and that is one neat place to visit if you can. I saw on Flickr that there were some people trying to get together to look it over.
There was huge stone fireplaces and the stage and balcony were still intact when I was there that were just too cool!
It was very dark so if you visit take a flashlight and a friend or two wouldn't hurt to keep an eye out definitely not somewhere to go alone.
In at Atlanta a friend took me to some kind of school that still used in some capacity but had some neat tunnels that went around underneath just wish I could have been there during the daylight. (dinner get together)