The United Nations Educational, Scientific and Cultural Organization (UNESCO) World Heritage Sites are places of importance to cultural or natural heritage as described in the UNESCO World Heritage Convention, established in 1972.
[1] The United States of America ratified the convention on December 7, 1973,[2] making its historical sites eligible for inclusion on the list.[3]The first sites in the United States added to the list were Mesa Verde National Park and Yellowstone National Park, both at the Second Session of the World Heritage Committee, held in Washington, D.C., September 5–8, 1978.[4] In total, 24 sites have been included, the most recent being a selection of eight structures exemplifying The 20th-century Architecture of Frank Lloyd Wright in 2019.[5] The twenty-four sites are located in twenty different states and two territories. Arizona, California, Hawaii, Illinois, Montana, New Mexico, New York, and Pennsylvania, each contain multiple sites (with the Frank Lloyd Wright site spread across six states), while two sites (Waterton-Glacier International Peace Park (Montana) and Kluane / Wrangell – St. Elias / Glacier Bay / Tatshenshini-Alsek) (Alaska) are transboundary sites shared with Canada.
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