The island of Poveglia in the Venetian lagoon has been described as the most haunted on earth. Used as a place of quarantine for many centuries, it is believed that over 150,000 plague victims died there. During the twentieth century, a mental hospital was built on the island, and rumours of torture, murder and even cannibalism by the doctor in charge were rife. The hospital has since been closed and the island is supposed to be off-limits to visitors. You can find out more and see pictures from Poveglia by clicking on the image below.