On April 22, 1970, more than 20 million Americans gathered on college campuses and in city squares to celebrate the first Earth Day. Some came to spread the word, others came to learn, but all were a part of the largest organized demonstration in American history. See these snapshots of events around the country.
President Theodore Roosevelt was caught in the middle of the first major battle for wilderness preservation in Yosemite National Park.
The contradictory history of a dam that became a statement of American power and prestige.
The evocative stories of teenage hoboes crisscrossing America on trains during the Great Depression.
A year in the life of Wyoming cowboys and the ranching families of the American West.
A great playwright's turbulent story, from childhood through the years of his Nobel Prize-winning career to his lonely, painful death.
Television game shows became an instant national phenomenon in 1955, but four years later contestant Charles van Doren admitted they were a scam.
In September 1959, Soviet Premier Nikita Khrushchev made an unprecedented visit to America, creating a media circus as he traveled from coast to coast.
When an earthen dam broke without warning, a small city in Pennsylvania was swept away in a wall of water over 30 feet high.