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".

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Mercer Caverns

Visitors enjoy the convenience of walkways and electric lighting. Cave tours last about 45 minutes. The cavern temperature is 55 degrees year-round. The tour covers about a quarter mile on walkways and stairs. There are a total of 440 steps, 208 down into the caverns and 232 up out of the caverns. Visitors descend a total of 160 vertical feet below the entrance.

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Limestone Caves

Learn About Caves!

Most caves are solutional caves, often called limestone caves for the common type of soluble rock in which they form. The caves form as groundwater dissolves quantities of soluble rock by seeping along joints and faults.

National Caves & Karst Day


 

Celebrate

National Caves & Karst Day

June 6, 2023

 

 

 

Cavern Kids

Educate your Students!

Many caves of the NCA offer educational programs to students, scout troops and more! Contact our Director for a list of caverns that offer these programs.

 

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