Is it possible that in fact us humans are aliens to this planet?
Could we have arrived here to the era of the caveman ?
Could we have been an advanced race that for some reason left our home planet for some reason in a life boat?
Upon arrival here we co habited with the cavemen to build the likes of the pyramids etc? Could several life boats landed in different places on earth and were unable to regain communications with the other survivors?
Could this explain why many cave paintings show pretty much the same drawings of space gods? But are thousands of miles apart?