Everything was so primitive back then, I can’t help but wonder if maybe ancient aliens gave them the ideas and the knowledge to build them.
The same will be said of us by future generations.
Yeah, civilizations with interstellar capability are usually experts in quarrying stone, too. 😜
My 1st husband was a PE-a very good one-he and I both grew up on small family ranches in a remote area with little exposure to big cities before we went to college. He had a 160 IQ and loved to solve construction problems and make/build practical things from a very early age. Humans have never been dumb-I’m sure there were high IQ individuals who liked to make tasks more efficient, productive, etc since there was a group of humans who set up a hunting/gathering co-op and living space in a cave during the last ice age, someplace in Europe or Asia-no ancient aliens required-just my dos centavos...
No, those people really were that smart.