I'm mystified by a few technologies ancient people had.
I mean, the boomerang is a great example.
It uses aerodynamic technology that we didn't understand until recently.
Yet it was invented by aboriginal people without the advanced math to invent it.
The same is true of ancient people who charted the movement of constellations and planets, to the point that we are only recently understanding those same movements.
Are such advancements evidence of prior higher civilization that collapsed, and left knowledge remnants scattered with various people?
Or are they evidence of some unknown geniuses who caused a giant knowledge leap, beyond what those cultures should have been capable of?