Just a few days ago i didn't have any cards from Syria but last week received 2 different cards, from 2 different postcrossers in less than 24 hours. Both are unesco. The 1st is a result of a trade with Doris "swissmiss" but the card is a RAS sent by Gilles, together with another RAS and other card.
The sites are Ancient City of Damascus and Site of Palmyra.
"Founded in the 3rd millennium B.C., Damascus is one of the oldest cities in the Middle East. In the Middle Ages, it was the centre of a flourishing craft industry, specializing in swords and lace. The city has some 125 monuments from different periods of its history – one of the most spectacular is the 8th-century Great Mosque of the Umayyads, built on the site of an Assyrian sanctuary." - in: www.whc.unesco.org/en/list/20
"An oasis in the Syrian desert, north-east of Damascus, Palmyra contains the monumental ruins of a great city that was one of the most important cultural centres of the ancient world. From the 1st to the 2nd century, the art and architecture of Palmyra, standing at the crossroads of several civilizations, married Graeco-Roman techniques with local traditions and Persian influences." - in: www.whc.unesco.org/en/list/23