Crystal Skulls Information, Legends-- National Geographic

Theories about where crystal skulls originated have ranged from the supernatural to the extraterrestrial.
The mystery surrounding the origin of crystal skulls has drawn supernatural speculation.

The Kingdom of the Crystal Skull - World Archaeology

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Crystal Skulls Information, Legends-- National Geographic, skull

Legend of the Crystal Skulls - Archaeology Magazine Archive

The Mystery of the Crystal Skulls - Owlcation