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Devil’s Tower, a 1000-foot monolith in Wyoming, was the first national monument protected under the Antiquities Act in 1906. Since then, the act has enabled the creation of more than 120 other national monuments, including the Grand Canyon (1906), the Statue of Liberty (1924), and the nation’s largest fully protected conservation area, Hawaii’s Papahānaumokuākea Marine National Monument (2006).
Prints and Photographs Division, Library of Congress