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Chetro Ketl, built during the 10th and 11th centuries, is one of the largest great houses in Chaco Canyon, New Mexico. Despite the harsh, high-desert environment, thousands of people once lived in and around what is now a World Heritage Site at Chaco Cult (Photo: National Park Service) Chetro Ketl, built during the 10th and 11th centuries, is one of the largest great houses in Chaco Canyon, New Mexico. Despite the harsh, high-desert environment, thousands of people once lived in and around what is now a World Heritage Site at Chaco Culture National Historical Park.