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Poveglia, Italy

Look closely at this picture. Actually, just look at it - it doesn't even have to be that close of a look. Just one glance will help you understand why this place is considered one of the most haunted in all of Italy. The Italian island of Poveglia used to be a quarantine zone for people struck by the Bubonic plague, which famously killed at least a third of Europe's entire population in the Middle Ages.

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Later on, the island became home to a mental asylum. It's suspected that some particularly sadistic and unethical experiments were performed on the patients unfortunate enough to find themselves there. The piece of land has since been abandoned and closed off to visitors.