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...