Nestled in the mountains where Tennessee meets Kentucky and Virginia, the towns of Harrogate and Cumberland Gap showcase the nation's history and the beauty of nature. Here, a British investor dreamed of creating a resort town that rivaled the spas of Europe. The Panic of 1893 crushed those plans, but it also allowed a former Civil War general to keep his promise to Abraham Lincoln that he would do something to assist the area's mountain people. As a university that became a memorial to the 16th president grew in Harrogate, locomotives steamed through Cumberland Gap. The 1930s and 1940s...