The ancient city of Chichén Itzá was built by which civilization?

Mayans. Chichén Itzá, in Mexico’s Yucatán Peninsula, was a major Maya city flourishing roughly 600–1200 CE. Its iconic stepped pyramid, El Castillo (Temple of Kukulcán), is aligned so that on the equinoxes a serpent-like shadow appears on the staircase—a testament to Maya astronomical precision. The city’s name comes from Yucatec Maya: “at the mouth of the well of the Itzá,” referring to the sacred cenote used for rituals. Remember: M for Maya and Mesoamerican astronomy. While Toltec-style art and warrior imagery appear at Chichén Itzá (reflecting interaction or influence), the Aztecs ruled later around central Mexico (Tenochtitlan), and the Incas were in the Andes of South America. Chichén Itzá is a UNESCO World Heritage Site and one of the New Seven Wonders of the World.