For serious discussion of the controversies, approaches and enigmas surrounding the origins and development of the human species and of human civilization. (NB: for more ‘out there’ posts we point you in the direction of the ‘Paranormal & Supernatural
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I don't know if there is, was a lost civilization. One that was highly intelligent? I do know, that the Romans would uncover a Dinosaur bone, and mistake as a human bone. They knew nothing about Dinosaurs. If you told them that giant lizards roamed the earth, they would look at you, as though you were crazy.
They valued and placed these bones in the middle square, for all to see the giants humans of the past. It became part of their Mythology. I suspect the same reaction took place with other cultures. I have seen pictures on the Internet, of large human skulls. Prof that giants existed. Well to that, I say there is a program called Photoshop, and W.C Fields and/or P. T. Barnum, were correct, there's a sucker born every minute.
Such a find, would be worth a fortune, and on display at all major museums.