books.google.co.uk - Hidden in the mountainous folds of Southwest Virginia, Natural Tunnel awaits the amazement of both seasoned acquaintances and new visitors alike. The main attraction of the 850-acre Natural Tunnel State Park, Natural Tunnel pierces Purchase Ridge for 850 feet at an average height of 50 feet and houses...http://books.google.co.uk/books/about/Natural_Tunnel.html?id=_vj4eDwXmQwC&utm_source=gb-gplus-shareNatural Tunnel
