This MIT Press book looks really interesting (and haunting):
Asylum: Inside the Closed World of State Mental Hospitals
...with a foreword by Oliver Sacks, an adaptation of which appears in the new NY Review of Books. The bulk of the book apparently consists of photographs that Christopher Payne took inside shut-down, abandoned state mental hospitals across the country.
Here in Indiana I've always been drawn to the former state mental hospital in Madison (way down in the southeastern corner of the state, on some bluffs overlooking the Ohio River...the town, btw, where they filmed the movie version of SOME CAME RUNNING). It, too, is a beautiful but somewhat spooky place. I think it's still open as a facility, though I'm not sure it's associated with the state anymore.