(1)- Mesa Verde National Park- the Park contains one of the world's best collections of cliff dwellings. It is one of the most popular attractions in the Southwest and is unique because it preserves the beauty of nature and the works of early man. Previously referred to as the Anasazi, the Ancestral Pueloan's thrived in the region from 600 to 1300 A.D. They then disappeared leaving behind fascinating historical relics.