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Melissani Cave at Karavomylos (actually a lake, formed when part of the land above collapsed during an earthquake), filled with brilliant blue water from an underground current which mysteriously flows right under the island, is a memorable experience. Melissani Cave is located at Karavomylos, 2 km from Sami town. The cave is 160 m long and 40 m wide. The stalactites are 16,000 to 20,000 years old.The floor is covered by a lake, about 40 m deep. In the centre of the lake is a small island. Archaeologists have discovered artefacts from the 4th and 3rd century BC, related to the cult of the god Pan, as well as a number of female figures, the famous nymphs of Melissani. The cave is open every day from 09:00 to late afternoon.