Scary Attic
Another one that has always perplexed me is No. 50 Berkeley Square in London. A historical house where basically every bit of its history until it was purchased by the current owner (an antique book dealer) is a mystery.
Basically, the “legend” is that there is a room upstairs that causes anyone who tries to sleep in it to die of fright-related conditions. It is said to have a few verifiable deaths in this manner.
Some of the stories like the two sailors and Robert Warboys can’t be verified AFAIK, though a former British prime minister did live there.
The most persistent legend is that the people are frightened to death by the ghost of the brother of a former owner named Myers. Myers’ brother was said to be insane and very violent, and Myers locked him in the upstairs bedroom and fed him through a hole in the door.
The ghost is described repeatedly as being tall, lanky and with a massive, gaping jaw. Another story is that some sort of octopus-like creature lived in the house, which somehow got there via old London sewers.
Either way, nobody has really ever been able to adequately investigate it, and it’s kind of frustrating.
Story Credit: Reddit/spiderlanewales