Leaving the port, heading towards Punta dell’Arcera, you will come across the first caves that are little known, but known by most of the inhabitants, such as the Naso, Faraglione and Sbruffo, so called because during the undertow it produces a spray of a long range water. This leads to the best known and most famous one all over the world, the Blue Grotto. A karst cavity, about twenty meters deep and 60 meters long, which allows entry through a crack in the rock one meter above sea level: for this reason, entry is only possible with good marine weather conditions.