The Blue Grotto in Capri

The Blue Grotto in Capri is one of Italy’s main draws for the incredibly vibrant blue hue visible within the cave. The peculiar effect is caused by sunlight passing through a deep underwater cavity and shining back up through the water, thus illuminating the cavern. The mouth of the sea cave is only a meter high so visitors can only enter the Blue Grotto with small boats when the tide is low enough to permit entry.