Poveglia
This island has about as much land as there is information about it's history. During the times of the Black Plague, the island was used to separate the healthy from those infected and it is also thought that 160,000 perished throughout the island's history. There's a hospital on the island, which was inserted there in 1922, but this one doesn't cure the sick. The doctor at the hospital was called Dr. Lobotomy and for good reason as he would do at least twenty lobotomies per day! Afterwards, he started to see what the spirits of the victims of the plague while conducting experiments. The ghosts of the plague later pushed him off the bell tower to his death and the hospital was never used afterwards. It has been like this to this day. Currently, the island sits inaccessible to the public and is slowly "sinking beneath the ocean".