Baalbek Trilithon

Thousand-ton stones lifted by no crane we know. The Romans built on someone else's floor.

The Baalbek trilithon stones (~800 tons each, with a 1,000+ ton block still in the quarry) are among the largest ever moved. Roman engineering explanations exist — but no Roman record describes moving them, and the podium may predate the temple above it. The genuine open question of method links it to Puma Punku, Sacsayhuamán, and the Serapeum: the archive's 'megalithic problem' cluster.