Deep in the heart of the southern Appalachian Mountains lies Roan Mountain, the second-highest peak east of the Mississippi and home to one of the most breathtaking, naturally recurring phenomenon in the world: 600 acres of Catawba rhododendron that bloom each year in mid-June. In an effort to promote tourism and draw attention to this area, North Carolina and Tennessee joined together to form the Rhododendron Festival in 1946. As attendance increased,...