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.
Native Alaskans, oil company representatives, environmentalists, politicians, and others tell the story of the 800-mile pipeline.
The contradictory history of a dam that became a statement of American power and prestige.
The coal miners' battle for dignity led to the largest armed insurrection since the American Civil War.
Robert Marshall, Aldo Leopold and Howard Zahniser dedicated their lives to protect the shrinking American wilderness.
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.