When an earthen dam broke without warning, a small city in Pennsylvania was swept away in a wall of water over 30 feet high.
She set out to save a species… us.
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.
The most daring and innovative accomplishment at the turn of the 20th century.
Her 1963 warnings about the effects of pesticides and herbicides sparked a revolution in environmental policy.
The life of the legendary photographer, known best for his black and white images of the wilderness of the American West.
President Theodore Roosevelt was caught in the middle of the first major battle for wilderness preservation in Yosemite National Park.