In 1960, Francis Gary Powers' U-2 spy plane was shot down over the Soviet Union.
After 18 years of struggles, the Golden Gate Bridge opened on May 27, 1937.
During World War II, more than a thousand women signed up to fly with the U.S. military as WASPS.
When two passenger ships collide off Nantucket in 1909, 1,500 people rely on 26-year-old Jack Binns to operate a new technology - wireless telegraphy - to save them all.
While the U.N. debated strategies for control of atomic energy, the U.S. Navy was preparing for nuclear tests on Bikini Island.
In 1934, American polar explorer Richard Byrd became the first to experience winter in Antarctica's interior.
Begun during the Civil War, the transcontinental railroad employed 20,000 men, mostly immigrants, who built the iron road with their bare hands.