Chichén Itzá stands as one of Mesoamerica's greatest archaeological sites, a vast temple complex in Mexico's Yucatán Peninsula showcasing Mayan-Toltec fusion architecture and culture. Built around 600 AD and expanded until 1300 CE, the site features the iconic four-sided El Castillo pyramid standing 79 feet tall with 365 steps—one for each day of the Mayan solar year. The complex includes the Great Ball Court, the Temple of Warriors, and the Observatory (El Caracol), demonstrating sophisticated astronomical and mathematical knowledge. Designated a UNESCO World Heritage Site in 1988, Chichén Itzá attracts over 2.6 million visitors annually, making it Mexico's second-most visited archaeological site and a primary symbol of Mayan civilization.