In the early 1830s, Texas, ruled by Mexico, held 20,000 U.S. settlers and 4,000 Mexican Tejanos, forcing residents to pick sides.
In 1960, Francis Gary Powers' U-2 spy plane was shot down over the Soviet Union.
A brilliant scientist, Oppenheimer was tasked with the development of the atomic bomb during World War II.
In 1934, American polar explorer Richard Byrd became the first to experience winter in Antarctica's interior.
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.
From the Revolutionary War to Operation Desert Storm - newly discovered letters read by celebrity actors tell of courage, longing, and sacrifice.
The unusual life of David Vetter, who lived permanently inside a germ-free environment due to severe combined immunodeficiency.