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.
Today one of the most-recognized figures in American literary history, poet Walt Whitman was denounced by critics in his own time.
Robert Marshall, Aldo Leopold and Howard Zahniser dedicated their lives to protect the shrinking American wilderness.
The life of the legendary photographer, known best for his black and white images of the wilderness of the American West.
The American effort to relieve starvation in Soviet Russia in 1921 during the worst natural disaster in Europe in 500 years.
Vivid memories of those trapped in the terrifying temblor of 1906 that killed thousands of Californians.
The coal miners' battle for dignity led to the largest armed insurrection since the American Civil War.
In 1934, American polar explorer Richard Byrd became the first to experience winter in Antarctica's interior.