When an earthen dam broke without warning, a small city in Pennsylvania was swept away in a wall of water over 30 feet high.
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.
Her 1963 warnings about the effects of pesticides and herbicides sparked a revolution in environmental policy.
The New Deal program CCC put three million young men to work in camps across America.
The inspiring story of the modern environmental movement.
Today one of the most-recognized figures in American literary history, poet Walt Whitman was denounced by critics in his own time.
The most daring and innovative accomplishment at the turn of the 20th century.
The story of the farmers who dreamed of prosperity and lived through ten years of drought, dust, disease and death.
In 1934, American polar explorer Richard Byrd became the first to experience winter in Antarctica's interior.