In the late 1200s within the span of one or two generations, they left their homes and moved away. The archeological sites found in Mesa Verde are some of the most notable and best preserved in the United States. Mesa Verde National Park offers visitors a spectacular look into the lives of the Ancestral Pueblo people. Scientists study the ancient dwellings of Mesa Verde, in part, by making comparisons between the Ancestral Pueblo people and their contemporary indigenous descendants who still live in the Southwest today. Twenty-four Native American tribes in the southwest have an ancestral affiliation with the sites at Mesa Verde.