Bosra in southern Syria, has an ancient history and was a prosperous provincial capital during the Roman era. Today it is major archaeological site and has been declared by UNESCO as a World Heritage Site. Bosra was the first Nabatean city in the 2nd century BC. This Nabatean Kingdom was conquered by Cornelius Palma in 106. The archaeological site contain many ruins from Roman, Byzantine and Muslim times. The main feature is the well preserved 2nd century Roman theatre, probably constructed under Trajan. It is the only monument of this type with its upper gallery in the form of a covered portico which has been integrally preserved.