Artist Thomas Moran accompanied the Hayden Survey of Yellowstone in 1871-72. Moran’s artwork of the region’s natural wonders, including the canyon of Yellowstone River, heavily influenced Congress and President Ulysses S. Grant to create the nation’s and the world’s first national park 150 years ago in 1872. “Tower Falls and Sulphur Mountain, Yellowstone National Park,” by Thomas Moran, Courtesy NYPL Digital Archives[/ca


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