10) 657 Boulevard
657 Boulevard is a chilling case of the Broaddus family who had just bought a new home in New Jersey and were preparing to move in. During this time, they received an anonymous letter written by “The Watcher” who claimed that he had been looking after the house for decades. He knew a lot of personal details about the family, the kids, and their house and claimed to have been stalking them.
The police tried their best but couldn’t reach any conclusion. The letter in their cryptic language began threatening the family and all the details mentioned in it about them were in fact true. The Broaddus family ended up selling the house and it was demolished after that. The identity of ‘The Watcher’ remains a mystery.