In the great expanse of our oceans, some haunting things are lurking: ghost ships. These vessels have traversed the seas without their crew—at least, they’re no longer present in physical form. Abandoned wrecks and ghostly sightings have filled maritime lore, and there’s nowhere more haunted than the open ocean. From the British ship of the 18th Century to the abandoned ship that ended up in a murder mystery, here are 20 Real Ghost Ships That Actually Exist.