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And all you need is lots of money, lots of labor, and some clever engineers, which are all things the ancient Egyptians had in spades.
It’s really not that hard.
Well, it’s very hard, it’s just not impossible.
Well, yeah, which is why building them took decades.
You don’t really even need clever engineers unless you want some kind of internal structure (which the Egyptians did). Otherwise it’s just a stack of rocks.