The latter half of the 19th century saw the "golden age" of the American cowboy; newly-built railroad lines made it easier to transport cattle from the western plains to the east coast, where they could fetch top dollar. As these photos reveal, a cowboy's life was a hard one, but living freely on America's western frontier nevertheless appealed to thousands of men.
These photos were taken across the American West between the late 1800s and the early 1900s.
Lyndon Johnson pushed progressive programs before the Vietnam War eroded his support. Part of the award-winning Presidents collection.
As the star attraction of Buffalo Bill's Wild West Show, Annie Oakley thrilled audiences around the world with her shooting feats. Part of the Wild West collection.
Malcolm X, a man who both terrified and inspired, expressed the anger and struggle of black people for freedom in the 1960s.
The Klondike Gold Rush in Canada's Yukon Territory saw 100,000 people make the treacherous journey in search of riches.
General Douglas MacArthur led American troops in World Wars I and II before being fired by President Harry Truman during the Korean War.
Forever enshrined in myth by an assassin's bullet, Kennedy's presidency long defied objective appraisal. Part of the award-winning Presidents collection.
Meet the Wizard of Odd. Robert Ripley was a new media star and the most popular man in America.
John Wesley Powell's epic journey into the unknown Grand Canyon was filled with adventure as his team mapped the Colorado River for the first time.