The Grand Canyon is an American treasure, visited by more than 6 million people a year, many of whom are rendered speechless by its vast beauty, mystery, and complexity. Now, in A Walk in the Park , author Kevin Fedarko chronicles his year-long effort to find a 750-mile path along the length of the Grand Canyon, through a vertical wilderness suspended between the caprock along the rims of the abyss and the Colorado River, which flows along its bottom. Consisting of countless cliffs and steep drops, plus immense stretches with almost no access to water, and the fact that not a single trail links its eastern doorway to its western terminus, this jewel of national parks is so challenging that when Fedarko departed fewer people had completed the journey in one single hike than had walked on the moon. The intensity of the effort required him to break his trip into several legs, each of which held staggering dangers and unexpected discoveries.