What’s way more interesting, imo, are the theories about lost civilizations.

Allegedly, some advanced civilization(s) existed before recorded history. I heard they found some artifacts in Egypt, seemingly made with tooling and techniques too advanced for the old Egyptians. Moreover there appear to be records suggesting some pyramids where there before the Egyptians build their own.

Very cool stuff, definitely more plausible than aliens, but I never looked into it any deeper.