Nesebar is an island just off the Black Sea coast of Bulgaria and a UNESCO World Heritage site. The city, known in antiquity as Mesembria, was founded by the Greeks 400 years before Christ as they colonized the Black Sea area and pushed out the Hippies also known as the Thracians. It became a base for the Byzantine empire's less than successful subjugation of the Bulgars. It changed hands many times between the Byzantines and the Bulgars with the Turks finally settling the issue. Along with Trabazon, it was one of the last Byzantiune outposts after the disasterous seige of Constantinople in 1453 by the Ottoman Sultan Mehmet the Conqueror that ended the 1000 year reign of the Byzantine empire. The Turks didn't need a fort and left the island to become a sleepy fishing port. Today, although while many are in ruins, the island boasts a fine collection of Byzantine churches saved by obscurity.