This important port on Southern Albania curls around a superb natural harbor, dominated by the hilltop 16th century Lekuresi Castle with distinctive round towers. In the town center are the ruins of a 5th century synagogue, later a Christian basilica, with remnant mosaic floors. Another picturesque ruin is the Forty Saints Monastery from the 6th century, which is thought to have been an important pilgrimage site. But the main attraction in southern Albania is the archaeological site of Butrint, a UNESCO World Heritage Site with extensive ruins of communities dating from prehistory, though the Greek and Roman eras, as well as the Byzantine period, until the medieval period.