5. Lier Sykehus, Norway
Few places are creepier than deserted psychiatric hospitals. At this medical complex in the town of Lier, 30 minutes south of Oslo, eight of the hospital’s buildings are still occupied by living mental health patients; the remaining four are vacant—and inhabited by nonliving former residents. The looming structure, which opened in 1926 and partially shuttered in 1986, was the site of frequent lobotomies and electroshock treatments.