Someone is displaying tech prowess in Egypt and Puma Punku. Its not the Romans....so who is candidate?
Absolutely correct. No lost legions in the Andes. And whoever worked at either place certainly didn't achieve this quality of work using pounders.
A high tech antediluvian elite, perhaps.
Any truth in, "And they were oblivious, until the flood came and swept them all away"? (Matthew 24:39)
Maybe, the survivors literally "headed for the hills" after Elephantine Island met Big Nile. Or, Puma Punku escaped the water by being shot 12 600 feet into the air landing with such a thud that everything broke.
Either way, it looks like someone had a patent on the stonemaker.