During the Great Depression, Americans built the Hoover Dam, overcoming technical challenges to erect one of the greatest engineering works in history.
The international race to develop biological weapons during the 20th century.
Robert Noyce's invention of the microchip launched the world into the Information Age.
The Alaskan Highway stands today as one of the boldest homeland security initiatives ever undertaken.
The Pennsylvania Railroad Company accomplished an enormous engineering feat, but destroyed a great architectural monument.
A six-hour series on how the West was lost and won, from the Gold Rush in 1848 until Wounded Knee in 1893.
Begun during the Civil War, the transcontinental railroad employed 20,000 men, mostly immigrants, who built the iron road with their bare hands.
Politics, culture, race relations, and technology in a year of change.
Originally settled as a mail stop, Las Vegas changed from an Old West vacation town, to a mafia haven, to the "Atomic City" and "Sin City."