Most people think of hauntings as something ghosts do, but the entity haunting 50 Berkeley Square in London, England, has paranormal enthusiasts and experts a bit baffled. By all accounts, it seems to be something other-worldly, but precisely what is still up for debate.
The earliest verified account of the horror dates from the 1840s, when 20-year-old Sir Robert Warboys took a dare to spend the night in the supposedly haunted upstairs bedroom of a house surrounded by scary rumors for years. He went in with a gun and a candle, and a bell system for alerting the landlord, just in case. He never came out alive. Just an hour after he entered the bedroom, the landlord heard the bell ringing frantically, followed by a gunshot. When he got to Warboys' room on the second floor, he found the young man dead, with a look of horror on his face and a bullet hole in the wall opposite the body. It seemed he had perished because of fright, but due to what, no one could ever figure out.
After a series of residents, many with stories of hauntings, the home was left to sit vacant. A second, better-documented incident occurred a few decades later in 1887. This time, two sailors - Edward Blunden and Robert Martin - found themselves without a place to stay on Christmas Eve and decided to stay in the empty house on Berkeley Street. Martin fell asleep but was awakened in the night by the sound of Blunden fighting something. Martin awoke to a scene that caused him to flee the building in terror: Blunden was being strangled by a brown, formless shape that had tendrils, one of which it was using to strangle Blunden. (These tentacle-like appendages have led some to suspect the entity is not a ghost, but a "semi-aquatic, predatory, cryptid phenomenon" that surfaces from the London sewer system.)
Martin ran from the house and returned with a police officer, only to find that Blunden had been thrown from the second story of the house and crushed on the street below. (In another version of the story, Blunden's mangled body was found in the basement, at the foot of the stairs.)
The house is still there today, complete with an antiquarian bookshop on the first floor. By police order, no employee or customer of the store is allowed to explore the building's upper floors, though they do report strange noises from that part of the house.
It's probably for the best, since the creature - or whatever it is - that lives upstairs has reportedly claimed at least two lives so far.