The Ancient City of Damascus is the historic city centre of Damascus, Syria. The old city which is one of the oldest continuously inhabited cities in the world, contains numerous archaeological sites, including some historical churches and mosques. Many cultures have left their mark, especially Hellenistic, Roman, Byzantine and Islamic. In 1979, the historical center of the city, surrounded by walls of Roman era, was declared a World Heritage Site by UNESCO. In June 2013, UNESCO included all Syrian sites on the list of World Heritage in Danger to warn of the risks to which they are exposed because of the Syrian Civil War.