President Theodore Roosevelt was caught in the middle of the first major battle for wilderness preservation in Yosemite National Park.
Her 1963 warnings about the effects of pesticides and herbicides sparked a revolution in environmental policy.
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.
This stunning film portrait of Yosemite National Park uses the 1851 diary of the first expedition of soldiers into the Native American territory.
High on a granite cliff in South Dakota's Black Hills tower the huge carved faces of four American presidents: George Washington, Thomas Jefferson, Abraham Lincoln, and Theodore Roosevelt.
The most daring and innovative accomplishment at the turn of the 20th century.
The New Deal program CCC put three million young men to work in camps across America.
A daunting story of shipwreck, starvation, mutiny and cannibalism amongst a group left abandoned in the high Arctic.