Teotihuacan: Temple of the Feathered-Serpent November 12, 2014 700 × 700 Teotihuacan: Temple of the Feathered-Serpent W4-0005: Aztec Calendar Stone The Aztec Calendar Stone was found amongst the ruins of Tenochtitlan, the Aztec Capital. It represents the cosmos and the ritual 260 day calendar, which was designed to honour the gods.