Blue Grotto

The Blue Grotto (Grotta Azzurra) is a sea cave on the northern shore of the island of Capri noted for its intense blue interior light created by sunlight passing through an underwater cavity. It is one of Capri’s most famous natural attractions.

Visitors enter the cave by small boats when sea conditions allow, passing through a restricted low opening to reach the main cavern where the blue light effect is most visible. The cave can only be visited during calm weather and is closed at higher sea states for safety.

The grotto was used in antiquity and later became a tourist attraction from the 19th century as part of the island’s development as a travel destination. Its reputation rests on the optical effect produced by submerged openings and the cave’s enclosed geometry.

Situated along Capri’s rugged northern coast, the Blue Grotto is reached by boat from Capri’s harbours or by sea excursions that include the island’s coastline.

• Access: Access into the grotto is by small rowboats and is dependent on calm sea conditions; boats enter through a low opening requiring passengers to lie flat during entry.
• Best time: Morning light on calm days produces the most vivid blue illumination inside the cave; visits can be canceled when the sea is rough.