Ancient civilizations had fairly thin survive or starve margins. Civilizations that sit atop the best agricultural land and build vanity projects instead of armies and practical infrastructure don't tend to sit atop that land for long. While we don't have precise records nobody is perplexed about how they moved stones nor how they mobilized the population, we have many well understood examples of ancient civilizations doing these things. It's largely a question of what other special circumstances let them engage in these projects so prolifically when Baybylon and China built <checks notes> walls.
Plenty of people, including myself, are perplexed about how they moved stones. Specifically, how 60--80 ton stones were moved up.
That's it. That's all there is to it.
Nothing more.
It isn't complicated, it's leverage, ramps, muscles, and patience.
It is likely that the entire construction program was planned around the 10-20 years it took to move the 80-ton weight-relieving stones much like how today I plan engineering and manufacturing efforts around the components with the longest lead times.
There were very few 80t blocks and those only had to go halfway up. Most were 2.5t.
Sacsayhuamán in Peru has 100t+ stones that were quarried 35km from the fortress location and transported up a steep incline. It took 6,000 men to move the stones.
Inca (1438-1570), Wari (600-1100) or Tiwanaku (300-1100)? Or some previous civilization?