Lonely Planet review
Four kilometres west of Amalfi, Conca dei Marini is home to one of the coast's most popular sights. Named after the eerie emerald colour that emanates from the water, the Grotta dello Smeraldo is well worth a visit. Stalactites hang down from the 24m-high ceiling, while stalagmites grow up to 10m tall. Each year, on 24 December and 6 January, skin-divers from all over Italy make their traditional pilgrimage to the ceramic presepe (nativity scene) submerged beneath the water.
SITA buses regularly pass the car park above the cave entrance (from where you take a lift or stairs down to the rowing boats). Alternatively, Coop Sant'Andrea runs daily boats from Amalfi. Allow 1½ hours for the return trip.