I also enjoyed reading this. I like the research you did.

What about Pilgrim Psychiatric Center and Kings Park Psychiatric Center. Both are located about 15 minutes away from each other and both were some of the largest hospital's of their kind. Attached are some photo's from my visit to both hospitals.

http://www.flickr.com/photos/jeremygarretson/sets/72157622722136566/
http://www.flickr.com/photos/jeremygarretson/sets/72157618511981952/
http://www.flickr.com/photos/jeremygarretson/sets/72157622538398833/