The document summarizes stops on a bus tour of the Appalachian Mountains, including: - Mammoth Cave in Kentucky, the world's largest known cave system formed in thick Mississippian-aged limestone. - Red River Gorge in Kentucky, featuring 60-80 foot high sandstone cliffs and over 100 natural sandstone arches. - The Blue Ridge Mountains near Great Smoky National Park, composed of older metamorphic gneisses and the result of rock transformation. - Stone Mountain in Georgia, a giant granite pluton intrusion that forms a single large mountain protruding from the surrounding flat plain.