The Marias River, Montana, USA, 1856.Artist: John Mix Stanley

The Marias River, Montana, USA, 1856. Looking up the Marias River to Fort Benton on a bluff above the river in central Montana. Print from Reports of Explorations and Surveys to Ascertain the Most Practicable and Economical Route for a Railroad from the Mississippi River to the Pacific Ocean made under the direction of the Secretary of War in 1853-1855, by Beverley Tucker, volume III, published by Sarony, Major and Knapp (Washington, 1856). (Photo by The Print Collector/Print Collector/Getty Images)