Legend of the Crystal Skulls investigates the 140 year old mystery of four infamous skulls that were carved out of rock crystal and that are kept at museums in Paris, London, Washington and in a private collection. Believed to have been one of the greatest archaeological discoveries ever made, the skulls have a spawned a world wide movement of skull devotees. The film investigates the true origin of the crystal skulls. With the help of modern science and meticulous documentary research, the film discovers that the crystal skulls were made in the 19th and 20th centuries, not in ancient Central America, and that they are thus part of one of the most elaborate archaeological hoaxes in history.