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/