The American Civil War was the first major conflict that was photographed extensively, bringing shocking and often horrific images to the front pages and into people's living rooms. Photography was extremely popular in the US at the time, and many photographers did not hold back from snapping even the most graphic of post-battle images to illustrate the horrors of war. Original captions were often scrawled below or on the backs of photos - you can read a few here in quotes.
Several of the images in this gallery are graphic in nature and may be disturbing.
The history of New York City and the people and forces that have shaped it over the past 400 years is told in a seven-part 14.5-hour series.
The Pennsylvania Railroad Company accomplished an enormous engineering feat, but destroyed a great architectural monument.
America's first great songwriter, Stephen Foster, wrote 200 songs but died a penniless alcoholic at 37.
The story of the polio crusade pays tribute to a time when Americans banded together to conquer a terrible disease.
Clemente was an exceptional baseball player whose career sheds light on larger issues of immigration, civil rights and cultural change.
On June 6, 1944, Allied troops invaded Normandy, fighting to free Europe from Nazi occupation and end World War II.
The story behind the development of the oral contraceptive that put women in control of birth control.
A look at five real-life "Rosies," the reality of working in defense plants during World War II and then having to give up those jobs for returning GIs.