Chichén-Itzá is a famous archaeological site located in the Yucatán Peninsula of Mexico. It was once a major city of the Maya civilization and is now a popular tourist destination, known for its well-preserved ancient ruins and historical significance. The most iconic structure at Chichén-Itzá is the towering pyramid known as El Castillo, or the Temple of Kukulcán, which was used for religious ceremonies and astronomical observations. Other notable features of the site include the Great Ball Court, the Temple of the Warriors, and the Sacred Cenote, a natural sinkhole that was used for sacrificial offerings.