The epic battle waged over dinosaur fossils by rival paleontologists in the American West.
When an earthen dam broke without warning, a small city in Pennsylvania was swept away in a wall of water over 30 feet high.
Robert Marshall, Aldo Leopold and Howard Zahniser dedicated their lives to protect the shrinking American wilderness.
In 1927, the Mississippi River flooded from New Orleans to Illinois, leaving a million people homeless and leading to a major black migration to the North.
In 1934, American polar explorer Richard Byrd became the first to experience winter in Antarctica's interior.
The contradictory history of a dam that became a statement of American power and prestige.
Native Alaskans, oil company representatives, environmentalists, politicians, and others tell the story of the 800-mile pipeline.