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The most endangered historic places in the U.S.

By: Ashley Chase on June 27, 2011, 10:30 a.m.
rock formations at chaco canyon in new mexico

Photo: markbyzewski/Flickr

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Greater Chaco Landscape

The Chacoan people inhabited a large part of northwestern New Mexico more than 1,000 years ago. Using impressive architectural and engineering techniques for their time, they constructed massive stone buildings, many of which contain hundreds of rooms, suggesting a sophisticated and developed culture. Although some sites are in ruins, many others are remarkably intact, and tourists may visit various sites within the area. The national parks within the greater Chaco area are protected by law, but Chacoan land outside the national parks does not enjoy the same protection and faces threats from human activities such as energy development.