Chaco Canyon is a significant archaeological site located in northwestern New Mexico, known for its ancient Puebloan culture. It features impressive stone structures, including multi-story buildings and ceremonial kivas, built between AD 900 and 1150. The site served as a major center for trade, politics, and religion among the Ancestral Puebloans. The canyon is part of the Chaco Culture National Historical Park, which was designated a UNESCO World Heritage Site in 1987. Visitors can explore the ruins and learn about the advanced engineering and astronomical alignments of the structures, reflecting the sophisticated society that once thrived there.