National Geographic Explorer Paul Salopek has traveled — on foot — through 21 countries, in a walk that’s taken eleven years so far. Traveling at a human speed has given him glimpses of things people ...

Images show how a valve on the deck of the stern is an open position, meaning steam was still flowing into the ship's ...

The combined drop of Upper and Lower Whitewater Falls (the latter extending into South Carolina) measures an astonishing 811 feet, dwarfing many more famous waterfalls. For comparison, Niagara Falls ...