Brachiopods and other fossils on the cave walls, older than dinosaurs, Koppus said. “These were created back when this part of Ohio was under water.” Tiny stalactites forming on the ceiling, a ...

If you go: Seneca Caverns Where: 15248 E. Township Road 178, Bellevue, about 70 miles west of Cleveland, easily accessible from the Ohio Turnpike and Ohio 2.