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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