Robert Marshall, Aldo Leopold and Howard Zahniser dedicated their lives to protect the shrinking American wilderness.
When an earthen dam broke without warning, a small city in Pennsylvania was swept away in a wall of water over 30 feet high.
Today one of the most-recognized figures in American literary history, poet Walt Whitman was denounced by critics in his own time.
The contradictory history of a dam that became a statement of American power and prestige.
The 300-year saga of the American whaling industry.
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.
Native Alaskans, oil company representatives, environmentalists, politicians, and others tell the story of the 800-mile pipeline.
President Theodore Roosevelt was caught in the middle of the first major battle for wilderness preservation in Yosemite National Park.