It's called the Great Blue Hole. Scuba divers and snorkelers have been cruising the surface waters for decades, but few have dared to venture deeper and explore what lies beyond the blackness.

Plunge into this deep blue hole and you'll discover imposing ancient stalactites (calcium deposits resembling icicles) and coral fringe. Declared a UNESCO World Heritage Site in 1996 – along ...

If you're scared of deep holes and the ocean, this is not the sinkhole for you. Taam Ja' Blue Hole can be found in Mexico's Chetumal Bay. It's an underwater sinkhole, known as a "blue hole ...

Take Blue Hole Park, for instance. This wistful grotto is a literal oasis, best known for its aquamarine swimming hole. Not to be confused with the other “blue holes” around the world ...

Named for its deep turquoise, crystal-clear water, the Blue Hole is located a little over a mile from the heart of Ocho Rios. Past visitors have said a trip to this natural wonder is a must-do ...

The Blue Hole covers an area of 164,000 square kilometers along the Argentine Continental Shelf, outside the Exclusive Economic Zone, with the following boundaries, to the north parallel 42°32 ...