#2 Trans-Allegheny Lunatic Asylum, West Virginia, USA
Originally designed to hold 250 people, this asylum ended up housing over 2,400 patients. Back in those days, patients could be admitted for even the most trivial reasons. These included asthma, laziness, and even greediness, which led to an overwhelming number of accepted patients and a shortage of staff members and beds. Now, tours in the facility give visitors a chance to see how people lived — or better, tried to survive — in this creepy building.