Chaco Culture National Historical Park, located in northwestern New Mexico, is a UNESCO World Heritage Site that preserves one of the most important pre-Columbian cultural and historical areas in the United States. The park is home to the ruins of Chacoan Great Houses, kivas, and other structures built by the Ancestral Puebloans between AD 900 and 1150. Visitors can explore these impressive ruins, which reflect the architectural and astronomical sophistication of the Chacoan people. In addition to its historical significance, the park offers opportunities for hiking, camping, and stargazing, with the Chaco Night Sky Program providing guided astronomy events.