Baalbek sits in the northern Bekaa Valley at 1170 m and holds the largest sanctuary the Romans ever constructed. Known as Heliopolis under Rome, it was built over two centuries from around 15 BCE, on a site already sacred to a Semitic sky god, which is where the name comes from.
The Temple of Jupiter
The main temple stood on a platform 88 by 48 m and was surrounded by 54 columns each 19.9 m high and 2.2 m across, the tallest in the classical world. Six remain standing, and they are the image of Lebanon. The platform beneath incorporates three limestone blocks known as the trilithon, each about 19 m long and weighing roughly 800 tonnes — how they were moved 800 m from the quarry has never been fully explained.
The Temple of Bacchus
The smaller temple beside it is one of the best-preserved Roman temples anywhere: the cella walls stand almost to full height, the ceiling coffers survive with their carving, and the doorway is intact. It is larger than the Parthenon. Which god it honoured is disputed; Bacchus is a modern guess based on the vine ornament.
The quarry
A short walk from the site lies the Stone of the Pregnant Woman, a cut block of about 1000 tonnes still attached to bedrock, and beside it an even larger one found in 2014, estimated at 1650 tonnes and the heaviest worked stone known.
The festival
The Baalbek International Festival has been held among the ruins since 1956, with performers from Fairuz to Ella Fitzgerald, interrupted only by the civil war. It runs in July and August.
Practicalities
Baalbek is two hours from Beirut across the Mount Lebanon range. The town lies in an area with a strong Hezbollah presence, and government travel advisories for the Bekaa are frequently restrictive; check the current situation before travelling, and go with a driver or organised tour rather than independently. The site itself is calm and staffed. Combine with Anjar and a winery on the way back.
Why here
The Bekaa was the grain basket of the Roman east and Heliopolis was a colony settled with veterans of the fifth and eighth legions. Building on this scale in a provincial valley was a political statement about the reach of the empire, and it was financed over more than two centuries by successive emperors, which is why the complex was never actually finished.
After Rome
The sanctuary became a Byzantine church under Theodosius, then an Umayyad fortress, then a Mamluk and Ottoman citadel; the medieval walls and towers around the temples date from that period. An earthquake in 1759 brought down most of the Jupiter columns. German archaeologists excavated the site from 1898 to 1904 and their photographs are still the standard record.