Palmyra is an ancient archaeological site located in modern-day Syria. Originally founded near a fertile natural oasis, it was established sometime during the third millennium B.C. as the settlement of Tadmor, and it became a leading city of the Near East and a major trading post on the Silk Road. The architecture of Palmyra combined Greco-Roman styles with those of Persia and Arabia, and the ruins that remain have significant cultural and historical significance. Recently, however, its treasures have been at risk due to the ongoing civil war in Syria.