For many years I volunteered at the Spa Little Theater in the Saratoga State Park in Saratoga Springs. many of us have witnessed a vision of the former creative director, Jonathon Foster, walking the halls during a rehearsal or tech run. Also, the local TV stations, prior to Covid, would send a team there on Halloween to see if they could see him.
There are many underground tunnels on the property and Simon Baruch used the space for many unpublished experiments in the 1920’s.
You should check it out.