4. Blue Grotto, Capri, ItalyThe Blue Grotto is a sea cave on the coast of the island of Capri made of limestone and the water within emanates a iridescent blue color similar in color to a sapphire blue topaz. This unusual light comes from another entrance to the cave, which reflects off the white floor of the water. But it also creates a magical environment said to have been used by emperors for bathing. It's one the most famous of all Capri's tourist attractions. You can reach Capri by a 40 minute-hydrofoil ride from the port of Ischia or Forio, and from there book a boat tour.
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