Hidden in the mountainous folds of Southwest Virginia, Natural Tunnel awaits the amazement of both seasoned acquaintances and new visitors alike. The main attraction at the 850-acre Natural Tunnel State Park, Natural Tunnel pierces Purchase Ridge for 850 feet at an average height of 50 feet and houses both a creek and a railroad. Trains run through the Tunnel on a regular basis, their horns echoing off the magnificent 300-foot cliffs surrounding the Tunnel. Author and geologist Tony Scales recounts the history of the great feature, from its geologic beginnings to the first written accounts of man's interaction with the Tunnel, through a period of commercial exploitation, to the present-day state park.