Grand Canyon of the Yellowstone by Thomas Moran.

Thomas Moran (February 12, 1837 ??August 25, 1926) was an American painter and printmaker of the Hudson River School in New York whose work often featured the Rocky Mountains. A talented illustrator and exquisite colorist, Thomas Moran was hired as an illustrator at Scribner's Monthly. During the late 1860s, he was appointed the chief illustrator for the magazine, a position that helped him launch his career as one of the premier painters of the American landscape, in particular, the American West. Moran along with Albert Bierstadt, Thomas Hill, and William Keith are sometimes referred to as belonging to the Rocky Mountain School of landscape painters because of all of the Western landscapes made by this group.