The life of the legendary photographer, known best for his black and white images of the wilderness of the American West.
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.
Her 1963 warnings about the effects of pesticides and herbicides sparked a revolution in environmental policy.
President Theodore Roosevelt was caught in the middle of the first major battle for wilderness preservation in Yosemite National Park.
The 300-year saga of the American whaling industry.
The journey of Prince Maximilian, German naturalist, and artist Karl Bodmer, who explored the Mississippi River area from 1832-1834.
The coal miners' battle for dignity led to the largest armed insurrection since the American Civil War.