P.O. Box 595
Sandusky, Ohio 44828
Known as "Ohio's Greatest Natural Underground Adventure" and a Registered Natural Landmark, located two miles west of State Route 269 south on Township Road 178. The only cave of its kind open to the public in the U.S., Seneca Caverns is a unique, educational adventure. Open daily 9 a.m. to 7 p.m., Memorial Day through Labor Day and weekends only in May, September and to Mid October.