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Craighead Caverns is an extensive cave system located in between Sweetwater and Madisonville, Tennessee. It is best known for containing the United States' largest and the world's second largest non-subglacial underground lake, The Lost Sea. In addition to the lake, the caverns contain an abundance of crystal clusters called anthodites, stalactites, stalagmites, and a waterfall.
Deanâs Blue Hole, located near Long Island in the Bahamas, was previously considered the worldâs deepest underwater sinkhole. Also a top location for divers, Deanâs Blue Hole has a diameter of about 82 to 115 feet on the surface, reports Atlas Obscura, but widens to about 330 feet as it deepens.