Inner Space Cavern
Inner Space cavern was discovered by a Texas Highway Department core drilling team in the Spring of 1963. Six inch core samples were taken to determine if the ground was stable enough to support a large highway overpass. As they were drilling one of the test holes, the bit suddenly dropped 26ft. and the highway crew knew there was something down there besides rock.
Visit Website
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.
Visit Website
