Neptune’s Grotto is a stalactite sea cave carved at the foot of the 110-metre-high Capo Caccia cliffs on the island of Sardinia, Italy. The cave was discovered by local fishermen in the 18th century and has since developed into a popular tourist attraction.

The entrance to the grotto lies only around a metre above the sea and the cave can therefore only be visited when the waters below are calm. A stairway cut into the cliff in 1954, the 654-step escala del cabirol, leads from a car park at the top of the cliff down to the entrance. Underwater all around there are many big underwater marine caves, paradise for the scuba-diving fans, the bigger and the most famous is the Nereo Cave, visited each year by thousands of scuba divers.

The combined length of the cave system is estimated to be around 4 kilometers, but only a few hundred metres are accessible to the public.Inside are passages of lit stalactite and stalagmite formations, and a 120-metre-long saltwater lake, which is at sea level. The cave was once a habitat for the Mediterranean monk seal, which has become extinct in the area.

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