US & Canada

The Burgess Shale, a crumbling slope in Canada's Rocky Mountains, has provided our first good look at the rich variety of organisms that once flourished in the region.

Evolution World Tour: Burgess Shale, British Columbia, Canada

Located in the Canadian Rockies, the fossil-rich dig site provides clues to scientists investigating how animal life began

The Appalachian Trail crosses 14 states, six national parks and eight national forests.

Tales From the Appalachian Trail

The stories of ten hikers who have traveled the 2,000-mile-path through the eastern United States tell the history of the trail

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