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.
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.
President Theodore Roosevelt was caught in the middle of the first major battle for wilderness preservation in Yosemite National Park.
The 300-year saga of the American whaling industry.
In 1934, American polar explorer Richard Byrd became the first to experience winter in Antarctica's interior.
High on a granite cliff in South Dakota's Black Hills tower the huge carved faces of four American presidents: George Washington, Thomas Jefferson, Abraham Lincoln, and Theodore Roosevelt.
Today one of the most-recognized figures in American literary history, poet Walt Whitman was denounced by critics in his own time.
The New Deal program CCC put three million young men to work in camps across America.