The Alaskan Highway stands today as one of the boldest homeland security initiatives ever undertaken.
President Theodore Roosevelt was caught in the middle of the first major battle for wilderness preservation in Yosemite National Park.
Robert Noyce's invention of the microchip launched the world into the Information Age.
Engineered by William Barclay Parsons, the 21-mile, four-track route of the New York City Subway was the largest public works project in history.
Begun during the Civil War, the transcontinental railroad employed 20,000 men, mostly immigrants, who built the iron road with their bare hands.
The unusual life of David Vetter, who lived permanently inside a germ-free environment due to severe combined immunodeficiency.
They were the first to brave the unknown.
A six-hour series on how the West was lost and won, from the Gold Rush in 1848 until Wounded Knee in 1893.