The southernmost inhabited island of Croatia, the island of Koločep, belongs to the Elaphite Islands. The local population calls the island Kalamota, making it the only island with two names. Its unofficial name dates from 1487 when was inscribed as Calamotta in the parish archives. The island is rich in monuments, namely the 17 cultural and historical sites of which most of them are churches and chapels. Its rugged coastline is full of tucked coves among which hid the Blue Cave, a real treat for night diving. During the summer months, when the sky above Dubrovnik is lavished with glittering stars, a view from underneath the sea level will make the night sky look magical.