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".
The Crystal Caves of Bermuda
The Crystal Caves are the most famous of many caves in Bermuda and are named after the crystal clear water that fills the caves. The clarity is so perfect that it is possible to see the cave floor, which at one point lies 55 feet below the water's surface.