"We know that the ancient Egyptians built the pyramids because they left us a huge amount of evidence. We have the signatures of architects. We have the markings on stones left by engineers. We have instructions, logs, and even graffiti left by the building crews on stones that have been excavated from places that were never meant to be seen. We have the homes of the workers, we have the written histories of the pharoahs carved into the stone, and we have a staggering wealth of testable artifacts recovered from sealed tombs. Everywhere, from the outer exposed surfaces to the inner hidden surfaces to the contents of sealed rooms, we have the self-referential history of the building of the great works of ancient Egypt. And if all of that is not enough, we have thousands of the Egyptians themselves, thanks to their practice of mummification."
"In short, a staggering amount of evidence exists that tells us about ancient Egypt, and not one shred of it has ever contradicted what they've told us their own selves."
-Brian Dunning