my only disconnect is i feel there might be something pre-historic there but not of ancient astronauts.
Just feel we are not first race on this planet and history as its made out is not complete. As in before continental drifts and shuffling of poles Antarctica must have been non-frozen and may be some race lived there... they perished, it is this race which left markers as time capsules all across the Globe as their memoirs. I mean like Pyramids or structures at Peru, Easter Island etc.
It was left for warning the civilization which would follow them to know that things "might" go wrong again and thus be prepared.
Already Sphinx many have said with its erosion patterns is not 4000 yrs old but should be over 10000yr old. Over so many years nothing else but these GIANT monuments only could survive and these markers are thus left for us to decipher.
But our arrogance and ignorance can never assume primitive man or any man before that to be more advanced than us.