Mysterious circumstances surrounding the deaths of Miguel José Viana and Manoel Pereira da Cruz in 1966 became known as the Lead Masks Case.

British diplomat Benjamin Bathurst suddenly disappeared in 1809. The theory is that he fell among thieves and was murdered for his coat and money.

The sound heard under the ocean in 1997 was really perplexing. Eventually NOAA determined that the Bloop is not a mysterious creature but something much simpler.

Mary Baker was a humble servant. For a few months she pretended to be Princess Caraboo, a woman kidnapped by pirates. Everyone in town believed her.

Filtering through the hoaxes, can religious passages, historic legends, or fossil records provide prood ancient giants actually existed?

Geli Raubal killed herself, though some think the cause of death is incorrect. But some believe she was murdered by her adoring Uncle Adolf Hitler.

The police were baffled by the crime scene. No gun was found, but the bullet that killed Joseph Bowne Elwell was neatly placed on a table.

Many of the practices developed in ancient Egyptian medicine is still used today, such as orthodontia, prescriptions and standardized treatments.