Mesa Verde features an elaborate four-story city carved in the cliffs by the Ancestral Pueblo people between 600 and 1300 A.D. The mystery surrounding this ancient cultural landmark is the sudden disappearance of the thousands of inhabitants who created the more than 4,000 identified structures.
The tallest sand dune in America is in Great Sand Dunes National Monument outside of Alamosa. This bizarre 46,000-acre landscape of 700-foot sand peaks was the creation of ocean waters and wind more than one million years ago.
Every year Denver host the worlds largest Rodeo, the Western Stock Show.