"The Blue Grotto in Capri is a gorgeous cave with a brilliant blue color to it due to two separate sources of light. One is tiny, the opening you can see in this picture which allows small rowboats in. The other opening is much larger and beneath the first, sending in rays of light into the cave from below. Of course, it is more difficult for this second hole to allow light through as it is underwater, but its size makes the difference." www.mediadump.com
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