Alcatraz was only in operation for less than 30 years, but in that time it gained the reputation as one of the most notorious prisons in American history.
Area 51's workers don't drive there. They fly in on a classified US Government airline known only as "Janet."
So notorious that its name is synonymous with madness, the history of Bethlem Royal Hospital, or Bedlam, is filled with some of humanity's darkest moments.
Plenty of famous landmarks promise apparitions, phantom footsteps, and unexplained voices after dark. But at some places, the documented history is disturbing enough without anything supernatural at all.
Poveglia Island near Venice is one of the most haunted places on this Earth.
The world's most haunted places can't escape from the dark events of their past.
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