A rabbit hole I've never gone down. Does anyone have any compelling theories, specaulations or videos/articles regarding this fabled lost city?

I can absolutely believe that an advanced human (humanoid?) race existed tens of thousands of years ago and that the story of human evolution which we're taught today is a lie. I simply refuse slaves with hammers built such architecturally sound and mathematically precise structures such as the pyramids in "fIfTy YeArS".

Anyways, show me what you got.