Global travelers in search of unique vistas and unusual experiences will want to hit The Great Blue Hole off the coast of Belize, the planet's largest sinkhole and a magnet for divers. It's just one of the seven wonders of the (modern) world -- along with the Ithaa Undersea Restaurant off the Maldive's Rangali Island's shore, the world's largest swimming pool at Alfonso del Mar resort in Chile and others.

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