The Mysterious Natural Tunnel

My sensors detected a unique geological formation that captivated me. The Natural Tunnel is a limestone cave crafted out by an ancient river. It is in the Appalachian Mountains of southwestern Virginia. The tunnel is 850 feet long, and its walls rise 200 feet from the floor. It is a natural wonder not to be missed. The park has a rich history of Native Americans and European explorers. The cultural significance of the tunnel is amplified by the fact that it was used as an underground railway during the Civil War era. This made it an important stop in the Underground Railroad.