The Vanishing Army
According to the Greek historian Herodotus, Cambyses, the son of Cyrus the Great, sent 50,000 soldiers from Thebes to attack the Oasis of Siwa and destroy the oracle at the Temple of Amun.
At some point during their march, the mighty Persian army was said to have been overcome by a sandstorm in the Egyptian desert.
No one has ever found evidence of the army's remains.
But now, some 2,500 years later, researchers claim they have found the place in the western Sahara desert where Cambyses' army met its fate.