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ListerOfSmeg said:
One thing that interested me was the models they found that actually ended up being aerodynamic when put in a wind tunnel. One being in a tomb in Egypt and the other pieces being from central America. Then you've got the Nazca lines and entire mountain tops being cut away but not a single sign of the top of that mountain was found anywhere near the base of it.

All of the buildings presented in the series have good archealogical work done on them, hit a library and find out the real origins of the sites... people built them is the short answer.

What they showed (mountain top cleared away) was a mesa.
http://en.wikipedia.org/wiki/Mesa