Cauldron Lake Lodge

While the Cauldron Lake Lodge is, on the surface, a resort for struggling artists in need of inspiration and therapy, in reality it is a prison for the occupants, Hartman keeping them all drugged up to use them both to profit off of their creations and use them for his experiments regarding the eldritch nature of Cauldron Lake. It is vague if all of his patient's eccentric behaviors (Emerson's child-like behavior, the random dancing lady singing to herself, Odin and Tor's senility) was always there, exacerbated by the drugs he keeps them on, or if Hartman's experimentation and their constant exposure to Cauldron Lake's power drove them over the deep end. Of course, this was before the Dark Presence shows up and starts possessing everything...

Example of:
Bedlam House