I just visited this place (old main) last Saturday (I drove up from Hartford Ct area). Yeah, the place is amazine; even more so than these incredibly well-done pictures depict. There are about five places to enter, obviously in the basement. I found one on a stairwell so I quickly got to lighted floors. The windows in the doors to the small rooms says it all...Steve.
Steve V
Location: Northampton State Hospital Gallery: Mental Floss