Longhorn Cavern State Park
The park features historical and nature study. Located in the heart of the Highland Lakes, Longhorn Cavern is near Inks Lake State Park which offers camping and lodging.
Seneca Caverns Registered Natural Landmark
Seneca Caverns is one of Ohio's largest underground caverns, and one of America's most fascinating geological wonders. Because it is so unique it is often referred to as "The Caviest Cave in the USA".