Everyone's talking about the long-awaited addition to the Indiana Jones trilogy: Indiana Jones and the Kingdom of the Crystal Skull. But many people don't know about the real Crystal Skulls of Central America's Maya empire.

That's right -- Crystal Skulls do exist, though their origins are controversial. The most famous Central America Crystal Skull is the Mitchell-Hedges Crystal Skull of Lubaantun, Belize. It was formed from a single piece of quartz, but for its detachable jaw. Inexplicably, it was carved against the crystal's natural axis, which should have made it shatter. Many people believe Crystal Skulls have supernatural powers, some good... and some otherwise.

• Read more about the Crystal Skulls of Central America.
• See photos of the Lubaantun Maya Ruins, where the Mitchell-Hedges Crystal Skull was found.