That's really not the conclusion you should be getting if you apply (my?) logic.

Of course math is involved. But those things were not built for the sake of math, their "roots" are in their respective functions (building something impressive, something religious, or crossing a bay).

Edit: I just checked your [4] http://en.wikipedia.org/wiki/Adam%27s_Bridge reference. You seem to be saying that this geological formation ("transoceanic bridge") is about mathematics too, implying it's man-made. If that's the case, we're playing by different rules of what "logic" means, and our discussion is completely pointless, no offense intended.