yeah, you should check out UnchartedX guy on youtube. one of his pods that sorta summarizes a lot of the various anomalous stoneworking artifacts, like the slabs of calcite in the temple of Karnak but most especially the obviously machine carved high precision granite vases... but at least in one of them i saw, he discusses some ~5000 year old papyruses that talk about how prior to the early predynastic egypt, there was a "race of gods" whose feats of technology were magical to the authors, and that they left all of this stuff behind. the iron age humans from the nearby areas wandered in because it was no longer populated and tried to maintain the legacy of their system and repaired the eventual decay of some of the structures, attempted to replicate the vases with alabaster, very poorly, and so on, and those remnants of the former owners of the land became revered artifacts.

and that's just the egyptians talking about it. at least dozens of other examples can be found of ancient peoples reporting such a race of gods across the world. the south americans, notably, also, such that after the (in this case, evil "gods") they were using boards to elongate the heads of their babies to resemble these former rulers. american indian tribes especially have stories related to strange people showing up, looking a bit weird, bringing warnings and advice about how to survive the impending disaster, with location specific advices. all who ignored it perished.