The Blue Grotto is a sea cave that was washed by sea water in the rocky shores of the island of Capri in southern Italy. The Blue Grotto is known for its amazingly blue waters. Rocks of various minerals, reflecting sunlight, give the water all sorts of bright and saturated shades, completely unearthly lilac, pink, orange and other fancy highlights. White sand, fantastically shaped stalactites, coral walls, phosphorescent water. The multi-colored mineral rocks below make you feel as if the whole bottom is dotted with deposits of precious stones. Water, reflecting their light, is painted in the same shades. In the caves, the water takes on an unnaturally rich blue-turquoise color. The deepest and darkest grotto goes 45 meters deep into the rock. This wonder of nature has been declared a national treasure, and you can get here on one of the private boats.