Emma Gatewood told her family she was going on a walk and left her small Ohio hometown with a change of clothes and less than two hundred dollars. The next anybody heard from her, this genteel, farm-reared, 67-year-old great-grandmother had walked 800 miles along the 2,050-mile Appalachian Trail. And in September 1955, having survived a rattlesnake strike, two hurricanes, and a run-in with gangsters from Harlem, she stood atop Maine’s Mount Katahdin. There she sang the first verse of “America, the Beautiful” and proclaimed, “I said I’ll do it, and I’ve done it.”