8. Kings Park Psychiatric Hospital, Kings Park, New York

Kings Park Psychiatric Hospital on Long Island opened its doors in 1885 as a solution to New York State’s surrounding overcrowded mental institutions and was the largest state-funded for a period of time. The 800-acre institution was a self sustaining facility with farms and railroad spurs to bring in supplies like coal.

A majority of the patients were assigned to farming duties to encourage the importance of fresh air and because it was believed to be a therapeutic exercise.

As the facility kept expanding, eventually large enough to provide its own heat and electricity, the population kept increasing as well, causing overcrowding throughout the 1950s before patient population steadily decreased. The hospital closed its doors permanently in 1996. But like Letchworth Village, a portion of the grounds remain available to the public to explore as a county park but the buildings are strictly off-limits.