Roan Mountain, a 6,286-foot-high peak, straddles the Tennessee and North Carolina state line in the Appalachian Mountains. Home to world-famous rhododendron gardens, the Appalachian Trail, the site of Gen. John T. Wilder's historic Cloudland Hotel, and record-breaking lofty balds, thousands of visitors, including explorer John Muir and Vice Pres. Richard Nixon, have ascended Roan Mountain over the last two centuries. Biologists, botanists, and tourists have enjoyed its unique natural setting. At the mountain's base and on its slopes, rural communities have endearing histories. Decades ago,...