Голубой грот (Grotta Azzurra) на острове Капри.

Website: - Capris Grotta Azzurra (Blue Grotto) is a sea cave famous throughout the world for the iridescent blue glow of its waters, an effect created by the sunlight which filters through a narrow submarine opening. The Grotta Azzurra has been famous since the times of the Ancient Romans, when the Emperor Tiberius elected it as his own personal nymphaeum.