I didn't take the time to watch the video or read through the posts.

I don't believe in the ancient alient hypothesis.

Take the pyramids of Egypt. When one looks at the EVOLUTION of Egyptian pyramid building, one sees that the earliers ones were far from perfect. They were small, geometrically imperfect, and unstable, often collapsing in on themselves after a couple generations. It took the Egyptians CENTURIES of trial and error (and the discovery of the pythagorean theorem) to perfect their building technique. . .

And besides, the pyramid is probably the easiest structure to build - they aren't exactly known for tipping over! (Now, if the ancients had built skyscrapers, I'd be impressed. . .)