Nine pieces of the World Heritage are based in Bulgaria, states UNESCO.
From now on each week we will be introducing you to one of them, starting with the Ancient City of Nessebar that is a part of Burgas Province.
The town is located on the coast of Black Sea and is known to have a 3,000-year-old history.
The Thracian settlement Mesembria became a Greek colony in 6th century BC.
The remains of Mesembria include an acropolis, a temple of Apollo, an agora and a wall from the Thracian fortifications.
The wooden houses built in the 19th century are typical for the Black Sea architecture.
During the Middle Ages Mesembia was one of the major Byzantine towns in the region and there are some monuments remaining from that period like the fortress and the basilica.
Description is available under license CC-BY-SA IGO 3.0
Photos: © Vincent Ko Hon Chiu