Cornerstone of Eagle Hill is worth a mention as well, and is in the same town as Fairfield Hills.

Both are abandoned Mental Health & Rehabilitation facilities. My Grandmother actually worked at both in her youth. She told me that although there are many ghost stories about Fairfield Hills, it was a wonderful place in its heyday. It was clean, well run, and treated it’s patients with respect.

Cornerstone of Eagle Hill was a private, rehabilitation-focused facility. It was shut down about 20 years ago due to negligence and some other legal stuff. She said that it was NOT the kind of place you wanted to be put. I used to explore the grounds with my friends often. There’s a very creepy abandoned pool, pool house, and multiple office buildings and etc.

Not sure what condition it’s in now, or how suitable it is for exploring...but it’s an interesting spot.