That explains why similar structures around the World (Mayans.Aztecs...Incas)have joints that are so tight that a knife blade can't be inserted. These primitive people had some technologies more advanced than what we have today.
Not really....They had all the time in the world on they're hands. No Tv's, no cars, no cellphones, no social media. They actually learned how to do shit.
To say that we don't have the tech that they had is, ludicrous. We build skyscrapers made of glass. We have electricity, automobiles, planes, cloning, the ability to treat many diseases etc....
For better or for worse, you cannot compare the tech we have today. As a history buff, it is tantalizing to think of such things, but there were smart and powerful people, who used a workforce that knew exactly what to do.
I know nothing of construction, but generation's of family members teaching you, as a way of life for them, is what built those structures. I watch shows where people build log cabins, houses, and all types of self-containing contraptions in the woods. It's not alien technology, it's human ingenuity.