A deeply moving account ever of walking the Grand Canyon, a highly dangerous, life-changing 750-mile trek. 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,…