What is truly great is the mystery of how very heavy stones, some a hundred and two hundred tons, were quarried, transported, very accurately carved and very precisely positioned so many millennia ago that there are neither written nor oral records about them.
These sites include Sacsayhuaman, Cuzco, Peru; Ollantaytambo, Peru; Machu Picchu, Peru; the Giza Pyramids, Egypt; Tiahuanaco, Bolivia; Nan Madol, Pohnpei, Micronesia; Stonehenge, England; and Easter Island.
These stones were clearly not carved by hand with bronze (or even steel) chisels. Nor were they moved with rope. Some try to say these are evidence of ancient aliens, but that's no different than throwing your arms up in despair.
I'm fairly certain these were constructed with ancient technology and knowledge that was lost in the flood. Several structures, especially the temple at Ollantaytambo and a pyramid north of Giza, are clearly incomplete. The builders got caught in the flood.
The mystery of how they did it is great.