For 18 months in the years 1918-19, a serial killer terrorized the citizens of New Orleans, his favored method of murder earning him a grisly nickname: “The Axeman”. The murders have never been solved.
The ghost ship Mary Celeste was found in December 1872 in the Atlantic Ocean west of Portugal, with her lifeboat gone and the crew missing. They had abandoned a perfectly seaworthy ship, and had apparently done so in a hurry, and left no sign as to why. They were never heard from again, and left behind one of the greatest mysteries of all time.