Robert Marshall, Aldo Leopold and Howard Zahniser dedicated their lives to protect the shrinking American wilderness. As a result, the Wilderness Act passed in 1964.
The epic battle waged over dinosaur fossils by rival paleontologists in the American West.
The most daring and innovative accomplishment at the turn of the 20th century.
The 300-year saga of the American whaling industry.
Today one of the most-recognized figures in American literary history, poet Walt Whitman was denounced by critics in his own time.
When an earthen dam broke without warning, a small city in Pennsylvania was swept away in a wall of water over 30 feet high.
Native Alaskans, oil company representatives, environmentalists, politicians, and others tell the story of the 800-mile pipeline.
The coal miners' battle for dignity led to the largest armed insurrection since the American Civil War.
The life of the legendary photographer, known best for his black and white images of the wilderness of the American West.