Actual crystal skulls exist in the real world. The best known is called “The Skull of Doom,” and this documentary tells how, in British Honduras (now Belize) in 1924, Frederick Mitchell-Hedges and his adopted daughter Anna found the skull in a Mayan temple. The film discusses the scientific testing designed to reveal whether this skull, and the others in museums worldwide, are really artifacts revered by the ancient Mayans or Aztecs, or whether the skulls represent a serious archaeological fraud.
Skeptics say that the crystal skull found by Anna Mitchell-Hedges was made by a sculptor at the request of her father and planted in the ruins at Lubaantun for her to find on her birthday. And it appears that even this story is a lie. According to documents verified by the British Museum, Mitchell-Hedges bought the skull at auction in 1943. There are no photos of the skull in the group taken during the expedition to Lubaatun, and no indication that Mitchell-Hedges displayed the skull before 1943. There are even questions as to whether Anna was present at Lubaatun at all.
Some believe the skulls were created by artisans in Atlantis or by beings on other planets. Typically, however, the skulls are linked to the ancient Mayans and Aztecs. The Aztecs represent the best choice for some experts because they used the skull motif throughout their religious imagery and had more expertise in making sculptures out of crystal than the Mayans.
Others think the skulls could not have been created without the use of modern technology. Recent studies have supported this theory. A test on crystal skulls conducted by the British Museum with electron microscopes found indications that a modern polishing wheel was used. Researchers concluded that the skulls were made in Germany less than two centuries ago.