City of ancient Syria, now in Lebanon, 60 km/36 mi NE of Beirut, 1,150 m/3,000 ft above sea level. It was originally a centre of Baal worship. The Greeks identified Baal with Helios, the sun, and renamed Baalbek Heliopolis. Its ruins, including Roman temples, survive; the Temple of Bacchus, built in the 2nd century AD, is still almost intact.