Baalbek is normally brought up in that context. If not in support of alien tech, it's referenced as some unexplained technological anomaly like both you and OP are doing here, with the misguided idea that the known technology of the time would not have allowed stones like that to be moved or cut accurately. This claim specifically > Before the Roman's they want you to believe they quarried them with copper tools. shows an ignorance of how easy it is to cut stone cleanly with even the most basic of tools, as is described at length in the linked video. Don't really care if you watch it or not, but you'll probably find it entertaining and informative unless you're desperate to believe in lost ancient rock cutting tech