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> the idea that some extremely old human societies built monuments in this way is not actually all that radical

Since the stones are still there for anyone to walk up and touch, it's pretty much incontrovertible. Go to Mallorca and you can find megalithic towns that date from thousands of years before Rome, which had to have come from a culture with some degree of technology because they were able to sail there and colonize it in the first place.

That said, you don't need giants to explain it. In Tarragona the foundations of the fortress wall are made of tight fitting stone blocks the size of a car that were quarried and moved hundreds of feet up the hill by regular Homo Sapiens Romans.