Mesa Verde National Park
Cliff Dwellings are the major attraction at Mesa Verde National Park in Mesa Verde, Colorado. Mesa Verde, Spanish for green table, offers a spectacular look into the lives of the Ancestral Pueblo people who made it their home from A.D. 600 to A.D. 1300. These sites are some of the most notable and best preserved in the United States. (Photo Credit: Doug Pensinger/Getty Images)