Tracking stuff in the sky does not make you an expert on what that stuff actually is.
The ancient Greeks, for example, could have built the Antikythera mechanism, but that does not mean they knew anything about what the planets actually were.
And a pile of rocks that lines up with the Sun does not a launch facility make.
Although still controversial in anthropological circles, the Dogon explained complex knowledge gained from far away star systems such as the Dog star.
It is possible that their myths relating to Sirius could correlate with the nature of the system.
Another possibility is that they learnt of things through outside contact. Not with extraterrestrials, but Earthbound foreigners.
But there is good evidence out there for Ancient as well as modern contact through consciousness with extraterrestrial beings.
Er, sorry to say this, but most people would say this is a "load of psychic nonsense."
I would generally be inclined to say the same thing.
If you are suggesting that the Maya or the Egyptians traveled to the stars via psychic... thingies, and that it is such an obvious phenomenon, the obvious question is: why are we so seemingly oblivious to it?