The Grotto is a well-known cave located in the town of Anacapri, on the island of Capri in the province of Naples.
The cave has a partially submerged by sea opening and depending on the tide cycle access may be more or less complicated.
The Roman emperors who spent holidays on the island seem the use as private pool, in particular it seems that Tiberius had built a step between his house and the cave, now if that was really burrow existed, it would be collapsed, so inaccessible. In any case became known since 1826, when it was visited by the German artist August Kopisch on indication of Angelo Ferraro, a fisherman.
Depending on the level of the sea guides on rowboats asking tourists to stoop at the mouth, talking and singing guides highlight echoes and sounds.
The best feature of the Blue Grotto is however the particular color game created by external light that penetrates through the submerged part, which can vary in the different hours of the day and with changing weather conditions.