Harlem Valley State Hospital

Harlem Valley State Hospital is a psychiatric hospital in New York, United States. Built in 1924, the facility consists of several stone buildings spread across a large tract of land and connected by underground tunnels.

The hospital opened its doors in 1924 and treated people with mental illness for decades, using insulin shock therapy and electro-shock treatments in its early years. The facility closed in 1994 after funding cuts led to the transfer of many patients to smaller facilities.

The buildings are now closed and access is prohibited due to structural collapse risks, mold, and asbestos. Warning signs and security patrols keep visitors from entering the decaying structures.

The grounds hold a cemetery called Gates of Heaven, where many graves remain unmarked. The morgue rooms with their old slab drawers now attract people searching for traces of the past.