One of the spookiest is the story of the Bell Witch in Tennessee. It was known for tormenting the Bell family with strange noises, physical attacks, and even speaking to them. Another is the story of the Amityville Horror, where a family experienced terrifying events in their new home like apparitions and strange smells.
Well, there's the story of the Winchester Mystery House. Sarah Winchester kept building onto her house in a very strange way because she believed she was haunted by the ghosts of those killed by Winchester rifles. The house has staircases that lead to nowhere and doors that open to walls. It's really spooky. And then there's the story of the Grey Lady at Hampton Court Palace. She's a ghostly figure often seen in the corridors, adding to the haunted atmosphere of the place.
The story of the Flying Dutchman is quite spooky. It's a ghost ship that is doomed to sail the seas forever. Sailors claim to have seen it, and it's often associated with bad omens. Also, the tale of Bloody Mary is really creepy. People believe that if you say her name three times in a dark, mirror - covered room, she will appear. There are many different versions of this story, but they all involve some form of malevolent spirit emerging from the mirror.