The Twelve-Angled Stone

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It makes no sense - assuming the wall was built from the ground up, why would the stone be carved to fit stones being put on top of it? Surely you would fit the upper stones to the lower, not the other way around?

This is not Inca construction, it is much older and done by an unknown ancient advanced civilization. The Inca found the foundation stones and built cruder construction on top. If you look around Cusco, and around the world, you will find similar advanced work, all in the lower foundations. The best source of information is Brian Foerster