An often overlooked ancient pyramid in Mexico was filled with pools of a rare element in its underground chambers, leading to new theories that the structure may have had a .
's Temple of Quetzalcoatl, or the Feathered Serpent Pyramid, in the is believed to have been built between 1,800 and 1,900 years ago.
The mysterious structure is shrouded in conspiracies ranging from being an ancient power plant to the engine for an extraterrestrial craft.
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