The American effort to relieve starvation in Soviet Russia in 1921 during the worst natural disaster in Europe in 500 years.
A biography of the last outlaws of the American Wild West
President Theodore Roosevelt was caught in the middle of the first major battle for wilderness preservation in Yosemite National Park.
When an earthen dam broke without warning, a small city in Pennsylvania was swept away in a wall of water over 30 feet high.
During the Great Depression, Americans built the Hoover Dam, one of the greatest engineering works in history.
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.
Before radar had been invented a devastating hurricane hit America, surprising residents of the East Coast and killing more than 600 people.
John Wesley Powell's epic journey into the unknown Grand Canyon was filled with adventure as his team mapped the Colorado River for the first time.