(To their knowledge, the speakers went undetected by the trails’ visitors.) (Nat Geo's ultimate guide to "touching grass.") Once visitors exited the paths, they were asked to fill out a ...

North America's deepest gorge, Hells Canyon, which slithers along the border of Idaho and Oregon, is a surprisingly new ...

The second tallest of the Seven Summits, Aconcagua sits deep in the Andes on the western edge of Argentina. At 22,841 feet, simply standing on top is a benchmark for high-altitude alpinists.