Before the Grand Canyon was made a National Park (1919) and before President Theodore Roosevelt placed the Grand Canyon under public protection by declaring it a national monument on January 11, 1908, the Smithsonian was interested in this natural wonder. In fact the first Secretary of the Smithsonian Institution, Joseph Henry wrote to Representative, later President of the United States, James A. Garfield in 1870 to urge that Congress fund John Wesley Powell's continued exploration of the Grand Canyon. Which they did with Congress appropriating $12,000 for Powell's expedition. Additionally in 1903 the fourth Smithsonian Secretary Charles Doolittle Walcott and his family traveled to the Grand Canyon. In honor of this UNESCO World Heirtage Site are some images of the visits to the canyon by Powell and the Walcotts.
- Record Unit 7004 - Charles D. Walcott Collection, 1851-1940 and undated, Smithsonian Institution Archives
- Record Unit 7177 - George P. Merrill Collection, circa 1800-1930 and undated, Smithsonian Institution Archives