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.
After 18 years of struggles, the Golden Gate Bridge opened on May 27, 1937.
President Theodore Roosevelt was caught in the middle of the first major battle for wilderness preservation in Yosemite National Park.
The international race to develop biological weapons during the 20th century.
The story of the polio crusade pays tribute to a time when Americans banded together to conquer a terrible disease.
The historic journey of Apollo 8 captivated the world in 1968 -- a bright spot in a year marked by political assassinations, race riots, and the Vietnam War.
The internationally famous carnival of delights in New York was the birthplace of the hot dog and the roller coaster.
William "Buffalo Bill" Cody's legendary exploits helped create the myth of the American West that still endures today.