The epic battle waged over dinosaur fossils by rival paleontologists in the American West.
In 1934, American polar explorer Richard Byrd became the first to experience winter in Antarctica's interior.
In 1927, the Mississippi River flooded from New Orleans to Illinois, leaving a million people homeless and leading to a major black migration to the North.
Vivid memories of those trapped in the terrifying temblor of 1906 that killed thousands of Californians.
The most daring and innovative accomplishment at the turn of the 20th century.
The contradictory history of a dam that became a statement of American power and prestige.
The American effort to relieve starvation in Soviet Russia in 1921 during the worst natural disaster in Europe in 500 years.
President Theodore Roosevelt was caught in the middle of the first major battle for wilderness preservation in Yosemite National Park.