We were able to tour into three different buildings on the campus of the now abandoned Missouri State Penitentiary. The grounds are home to a lot of history and some pretty famous faces passed through there. Opened in 1836 and closed in 2004. Since then, the grounds have only been partially maintained and the decay is amazing. One of the more famous prisoners staged an escape and later assassinated MLK, Jr - the one and only James Earl Ray.
I'd love to go back when I wasn't sweating buckets. I really need to do some more research about the place - it is just fascinating to see a side of things that one hopes one never sees.
I think this one is the winner - it's a really tough call: