The Pennsylvania Railroad Company accomplished an enormous engineering feat, but destroyed a great architectural monument.
They were the first to brave the unknown.
The unusual life of David Vetter, who lived permanently inside a germ-free environment due to severe combined immunodeficiency.
A Utah farm boy builds a prototype for a television, but is thwarted by movie studio executives wanting to control the technology.
It was the largest fire in American history: by the time it was all over, more than three million acres had burned and at least 78 firefighters were dead.
The worldwide migration by eager gold-seekers turned California into a land of opportunity and fierce competition.
Brothers Wilbur and Orville Wright built a flying machine that made its first flight in Kitty Hawk, North Carolina in 1903.
The grave truth behind modern forensics was discovered in 1920s New York.