Poveglia was used as one of Venice’s plague quarantine stations from 1793 to 1814. It is said to have housed more than 160,000 people who lived their final days there. Napoleon found the island enough out of the way to store weapons, which led to battles and more dead on the island. A mental hospital opened on Poveglia in 1922 but has a horrible history of a doctor torturing and killing his patients. With this sad past, the island is thought to be haunted and many ghost hunters visit there.