you post: “I would not be surprised at all because tiling a pool is a lot simpler than building a pyramid”
Is this referencing the Egyptian pyramids?
Central American pyramids rival those of Egypt - and there are many more of them (You probably know this, but your post isn’t clear.)
http://www.journeyidea.com/the-great-pyramid-of-cholula/
There are more pyramids in Mexico that all the rest of the world combined.
The Cholula Pyramid in Mexico is the world's largest.
The pyramids at Caral, Peru may yet prove to be older than the Egyptian pyramids---or, at least as old.