After watching lots of videos on megalithic sites over the years. Now including the 1nm scan renders of stone vaces. I'm convinced, we have not only been highly advanced in the past. We had heavy machinery, and computers.. All lost/destroyed after the "younger drias" ~13000 years ago.. POSSIBLY, 100k years ago or more..
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Or we had visitors lending a hand
I thought that for many years. But it is far more likely it was just an earlier iteration of us.. I mean, it seems humans have been on earth, anatomically the same for at least ~1million years, look how far we've come in just the last few hundred! We could easily have risen and fallen many times before.
If, say a few hundred managed to get off world. To survive meteroid bombardment.. returned decades or hundreds of years later. Humans back in some age, and they'd be seen as gods (or aliens)