Mary Celeste
The Mary Celeste (often misspelt Marie Celeste) was an American brigantine.
On December 5, 1872 it was found, with all sails set, adrift between Portugal and the Azores. There were no crew on board, and the ship's lifeboat, chronometer, sextant and register were also missing. None of these was ever found.
Metaphorically, Mary Celeste is now used to mean a place, apparently normally occupied, that is currently deserted.
The disappearance of the Mary Celeste is often used as evidence of the importance of the Bermuda triangle (one of thousands of examples) and yet some theorists claim that the Mary Celeste may not have passed through the Bermuda triangle at all. Since the Mary Celeste was found some months after its last contact with anyone, it could have gone anywhere, and it is speculation whether it did, or alternatively did not, go through the Bermuda triangle, and yet it is used as an example by anti-Bermuda triangle theorists to try to prove that the Bermuda triangle is not remotely significant.