At a bare minimum you should watch “the revelation of the Pyramids” which is posted within the first three pages of the thread.

But if you won’t, at least know that whoever build the Gizah Plateau complex was aware of the size of the Earth, knew the meter as we know it today, knew the numbers Pi, phi and Phi, and was capable of using them to build these monuments with precisions that are hard to attain even with our current most advanced methods: