The genius and creativity of the ancient Egyptian engineer
Valley Temple of the Pyramid of Khafre in Giza 4500 BC.
The ancient Egyptian engineer did not stop using huge stones of solid granite, but rather he carved the corners of the sacred buildings in the same stone and interlocked them alternately to connect two walls between them at a right angle, as the corners are the weakest points of the wall to give solidity and guarantee the immortality of the temples.