Baalbek: what is older, the temple or the remains below it?
Earlier remains lie beneath the Roman temple. Their age does not make every part of the great structure above them equally old.

What is documented at Baalbek
UNESCO's World Heritage record for Baalbek describes one of the finest examples of Imperial Roman architecture, a sanctuary complex built over a site with earlier remains. Earlier ruins beneath the Roman construction are attested; the record does not date the Trilithon or the podium as prehistoric. UNESCO World Heritage Centre ↗
Two claims, kept apart
The research record stores a claim dispute: the statement that earlier ruins prove a prehistoric construction date for the Trilithon is marked unsupported. The current archaeological model places the megalithic podium within the Hellenistic-to-Roman construction sequence, while some authors argue for a much older platform.
What would settle it
The dispute lists its missing evidence: a securely dated archaeological context tying the blocks themselves to a prehistoric phase, and direct or stratigraphic dating for the quarrying, dressing, transport, or placement of the monoliths. A secure Roman-period construction context for those elements would falsify the prehistoric claim.
What does a photo of a stone block prove?
Early occupation, earlier ruins, Roman podium construction, and alternative megalithic claims are four separate objects here. Which one does a photograph of a huge stone actually show?