Blue Grotta Cave, Italy
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The Blue Grotto is one of the main attractions of Capri, Italy. It is a sea cave off the coast which is famous for its fluorescent blue water. This phenomenon occurs due to the caves two entrances. The first is the main entrance where only a rowboat can fit in one at a time and the second from an even bigger hole underneath the entrance.
The light that comes through the second hole is just above the waterline which lights the water inside of the cave. Here, tourists can swim in this magical-looking water that occurs only by chance.
