Ohio Caverns - Opening hours, tour information and history. Located in West Liberty. - http://www.ohiocaverns.com/
Perry's Cave - Guided tours through a natural limestone cave, offering gemstone mining outside and a unique gift shop inside. Put-in-Bay, South Bass Island, Lake Erie. - http://www.perryscave.com/
Olentangy Indian Caverns - Thirty minute tours re-create the days of lost Indian tribes and pioneer explorers. Delaware. - http://www.olentangyindiancaverns.com/