a) Mesa Verde

Mesa Verde National Park, located in southwestern Colorado, was once home to the ancient Puebloans. The park is famous for its well-preserved Ancestral Puebloan cliff dwellings, notably the Cliff Palace and Spruce Tree House. These structures, built between the 6th and 12th centuries, are some of the most notable and best-preserved in the United States. Mesa Verde National Park offers a glimpse into the lives of the Ancestral Puebloans and is an important archaeological and historical site, showcasing the architectural and cultural heritage of these ancient people.