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.
A daunting story of shipwreck, starvation, mutiny and cannibalism amongst a group left abandoned in the high Arctic.
The contradictory history of a dam that became a statement of American power and prestige.
In 1934, American polar explorer Richard Byrd became the first to experience winter in Antarctica's interior.
Today one of the most-recognized figures in American literary history, poet Walt Whitman was denounced by critics in his own time.
In 1927, the Mississippi River flooded from New Orleans to Illinois, leaving a million people homeless and leading to a major black migration to the North.
The New Deal program CCC put three million young men to work in camps across America.
The most daring and innovative accomplishment at the turn of the 20th century.