Mexico's Temple of Quetzalcoatl, or the Feathered Serpent Pyramid, in the ancient city of Teotihuacan is believed to have been built between 1,800 and 1,900 years ago. The mysterious structure is ...

Liquid mercury found beneath Teotihuacan’s pyramid baffles scientists. Was it a spiritual mirror, lost tech, or ancient power ...

Built between the 1st and 7th centuries A.D., it is characterized by the vast size of its monuments – in particular, the Temple of Quetzalcoatl and the Pyramids of the Sun and the Moon, laid out on ...