In 1960, Francis Gary Powers' U-2 spy plane was shot down over the Soviet Union. The plane had provided a high-tech peek behind the Iron Curtain during the Cold War.
After the Soviet blockade of West Berlin, British and American pilots delivered tons of food and fuel to the German city by airplane for nearly a year.
The story of the polio crusade pays tribute to a time when Americans banded together to conquer a terrible disease.
The worst epidemic in American history killed over 600,000 Americans during World War I.
Two days in 1967 revealed a nation divided over a war that continues to haunt us.
"The Wizard of Menlo Park," Inventor Thomas Edison, built the first practical light bulb and revolutionized the world.
The U.S. government's response to the Holocaust was slow and fueled by complex social and political factors.
The story of a Vietnamese mother, the Amerasian daughter she sent away for adoption, and their reunion 22 years after the Vietnam War.
Equipment failure, human error and bad luck led to the country's worst nuclear accident in 1979.