The Grotta dello Smeraldo ("Emerald Grotto") is a cave, partly inundated by the sea and located in Conca dei Marini, Italy, on the Amalfi Coast.
It is one of several caves worldwide, that is flooded with a brilliant blue or emerald light. The quality and nature of the color in each cave is determined by the unique lighting conditions in that particular cave. The grotto, which...