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.
A year in the life of Wyoming cowboys and the ranching families of the American West.
Robert Marshall, Aldo Leopold and Howard Zahniser dedicated their lives to protect the shrinking American wilderness.
The contradictory history of a dam that became a statement of American power and prestige.
Between 1890 and 1920, 12 million people emigrated from Europe arriving in New York Harbor and Ellis Island.
In 1934, American polar explorer Richard Byrd became the first to experience winter in Antarctica's interior.
The personal journey of three generations of a Japanese American family, including their stint in internment camps during World War II.
America came apart in 1964 and has since been reborn.
The evolution of rhythm and blues through the careers of singers Ruth Brown and Charles Brown, with contemporary performances by both.