The story of the polio crusade pays tribute to a time when Americans banded together to conquer a terrible disease.
The grave truth behind modern forensics was discovered in 1920s New York.
At the height of segregation, an unlikely alliance between a black medical genius and a white surgeon led to a pioneering medical breakthrough.
In the early 1830s, Texas, ruled by Mexico, held 20,000 U.S. settlers and 4,000 Mexican Tejanos, forcing residents to pick sides.
The impact of tuberculosis in America, once the deadliest killer in human history.
Robert Moses fueled some of the most ambitious -- and controversial -- public works projects ever conceived.
The Alaskan Highway stands today as one of the boldest homeland security initiatives ever undertaken.
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.