During the Great Depression, Americans built the Hoover Dam, overcoming technical challenges to erect one of the greatest engineering works in history.
John Wesley Powell's epic journey into the unknown Grand Canyon was filled with adventure as his team mapped the Colorado River for the first time.
The grave truth behind modern forensics was discovered in 1920s New York.
Begun during the Civil War, the transcontinental railroad employed 20,000 men, mostly immigrants, who built the iron road with their bare hands.
In 1934, American polar explorer Richard Byrd became the first to experience winter in Antarctica's interior.
During World War II, more than a thousand women signed up to fly with the U.S. military as WASPS.
The first around-the-world air race was sponsored to prove that the airplane had a commercial future.
The worldwide migration by eager gold-seekers turned California into a land of opportunity and fierce competition.
A marvel of engineering, architecture, and vision, the story of the Beaux Arts structure on 42nd street that forever changed midtown Manhattan.