From the depths of Death Valley, Daniel Arnold set out to reach Mount Whitney in a way no road or trail could take him. Anything manmade or designed to make travel easy was out. With a backpack full of empty two-liter bottles, and the remotest corners of desert before him, he began his toughest test yet of physical and mental endurance. Badwater Basin sits 282 feet below sea level in Death Valley, the lowest and hottest place in the Western...