Ride through Kingsport and into Virginia to check out what William Jenning Bryan called the “8th Wonder of the World”. Natural Tunnel is more than one million years old and has been attracting visitors for more than two centuries. Park your bike and ride the chairlift down to hiking trails, picnic tables, and, of course, the incredible tunnel itself, and bask in wonder. If you’re lucky, you may even spot a coal train passing through.