The old city of Nessebar is one of the great jewels of Bulgaria. It was built on a small peninsula (actually it was an island that is artificially connected to the mainland by a 400 m isthmus) and is one of the cities with the most churches per capita in the world. When you enter the citadel you are received by the imposing Walls of Nessebar, built by the Thracians in the 8th century B.C. Over the years this fortress protecting the center of Nessebar, the ruins of which can still be admired, underwent changes during the periods of Greek, Roman and Byzantine rule.  keep reading