The Blue Grotto is located on the southern coast of Malta, west of Wied iz-Zurrieq facing the little deserted islet of Filfla. The site got its name from a British soldier who thought that since the area looks like the Grotta Azzurra in Capri, it deserves the same name, and in fact Blue Grotto is the equivalent for Grotta Azzurra in English.
The site is extremely popular, attracting some 100,000 tourists per year, also for diving purposes. The site also features in the film Troy (2004) starring Brad Pitt. The location of this fascinating natural grotto combines with sunlight and the surrounding chain of caves to reflect the phosphorescent colours of the submerged flora and the deep dark shade of blue of the sea.