Missouri is famous for its numerous caves, many of which are open to the public. A popular state park in the central Ozark region much visited for its fishing opportunities, also boasts a natural tunnel born from the same steady forces of water erosion. A trail just over three miles in length traversing over rugged woodlands and creek beds ultimately leads to a gaping, dark hole in the rock bluffs. As visitors approach closer and enter into the cool embrace of the tunnel, a faint glimmer of sunlight can eventually…