Final answer:
Frederick Mitchell-Hedges claimed that the 'Skull of Doom' was found in the Mayan ruins of Belize, an area known for significant Mayan artifacts and architecture.
Step-by-step explanation:
According to Frederick Mitchell-Hedges, the "Skull of Doom" was allegedly found in the Mayan ruins of Belize. The intriguing artifact has often been associated with the ancient Mayan civilization, which is renowned for its monumental architecture, such as the Temple of Kukulcan at Chichen Itza and the Mayan Stele H at the Great Plaza in Copan. While the skull has been subject to debate and speculative stories, it is most commonly linked with the Mayan culture, not the Incan culture of Peru nor ancient sites like Egypt or Greece.