Atlantis
This is a mystery that has plagued different civilizations for years. It’s rumored that there is an underwater city somewhere in the ocean. People have claimed to find it in the Bahamas, the Greek Islands, Cuba, and Japan. Plato first spoke of it in 360 B.C., and claimed it was a great naval power that sunk into the sea. Many experts debate the existence of Atlantis, and even if it makes sense for it to happen, and many more have tried to find it themselves.