The Temple of Bel was Palmyra's greatest religious monument — a vast walled complex surrounding a temple dedicated to the Babylonian god Bel, consecrated in 32 AD and incorporating earlier pre-Roman structures. The outer temenos (sacred precinct) walls were over 200 metres on each side and survive largely intact; the main cella was destroyed by ISIS in 2015.
Bel was the supreme deity of Palmyra, a Semitic equivalent of Zeus who absorbed Greco-Roman characteristics over centuries of cultural mixing. The temple's decoration combined Roman architectural vocabulary with Near Eastern religious traditions — a fusion typical of Palmyra's position as a wealthy trading city where different civilisations met and mingled.