The Norristown State Hospital has been open since the 1880's. Norristown was one of the first psychiatric hospitals to use the kirkbride plan to make sure patients got lots of air and light and also separates men and women in different wings. Wards with non-violet patients were usually left unlocked so patients could leave and roam the grounds during the day or do their work assignments. Jobs patients could do were Farming, Administration, Bakery, Billiard room, Boiler room, Bric-a-brac shop, Brush shop, Butcher, Carpenter shop, Dispensary, Garden, Kitchen, Laundry, Machinists, Mattress shop, News-room, Out-door improvement, Painters, Plasterers, Plumbers, Printing office, Scroll saw shop, Shoemakers, Stables, Store-rooms, Tailors, and Weavers. In 1897 a nursing school was also opened on the grounds as well as a nurses home, for all the nurses working at Norristown. At the height of the hospital in 1940 the hospital had 5,000 patients. During the 1930's and 1940's the hospital started treating patients with electro-shock therapy, insulin therapy, and lobotomies. Soon after, medications for mental illness started coming out, and the number of patients at psychiatric hospitals started to shrink. Norristown State Hospital is still open today, but only holds 150 patients, and most buildings lie abandoned.
A few fun facts about Norristown:
The film Silver Lining Playbook was also partially shot at Norristown.
Serial killer H.H Holmes was employed at the hospital but then quit after a few days
George Washington stayed on the grounds of Norristown in 1778
Was home to murders, John du pont, Sylvia Seegrist and Richard Griest
I think it might be hard to get in because the hospital is still active.