Having seen both I still think Teotihuacan in Mexico and the avenue of the dead is far mor impressive 20-30km of temples buildings and pyramids and noone is exactly sure who built it.

If you don't know of it (http://en.wikipedia.org/wiki/Teotihuacan)

I believe in "Evil, Bad, Ungodly fantasy science and maths", so I am undoubtedly wrong to you.