Poveglia Island: If you’ve seen “Shutter Island,” then this location will be familiar to you. Not far from Venice, Italy, this island was once home to one of the most horrific insane asylums that was reputed to perform cruel medical experiments or lobotomize their patients. Today, the island is completely abandoned, but the remnants of the hospital/prison still remain. Nearby locals and tourists are not allowed to step a foot on this island (except the ghosts of the criminally insane and their mad doctors).