In regards to ancient civilisation contacted by aliens, it's an interesting question. For example, we have a large tribes of people that live on Earth who rarely if ever associate with the modern world. Some of these tribes (sometimes numbering in the hundreds) have been living in their own civilisations for tens of thousands of years. Why have they not built impressive structures? We know they have the time, the resources and the manpower.
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Large populations for the man power? No they don't which of these tribes number 10s of thousands or even hundreads or thousands. Then you have to look at why they where built. Ancient astronaut theory is a a steaming pile of **** although I do enjoy and reading Graham Hancock books but he lives in dream land.
There's massive difference in the cultures of small tribes and Egyptians, Aztec, incans and the far east temple building tribes.
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