The following book is on an archeological discovery of the papyrus draft records of the construction manager of the Giza pyramids. They discuss source of material, transportation of the material, organizing the construction gangs, etc. These 4,600-year-old documents read just like progress reports of a modern construction effort. Here’s the book, link below!
https://www.amazon.com/gp/product/0500052115/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
You don’t need aliens or any supernatural explanations. Such explanations insult us as humans. Our ancestors even the very remote ones were very clever.
“Such explanations insult us as humans”
Well not all humans, just the stupid adult ones. Which is most people on this topic when it comes to space travel. A solar system only 10 or 15 light years away would take literally a million years at space shuttle speeds. I remember reading Chariots of the Gods over and over again as a kid and believing every word of it LOL.