The Pyramids were not laid out willy-nilly on the Giza Plateau. Each side of each of the three Pyramids lines up precisely east-west or north-south. It's a bit of a mystery how the ancients achieved such a perfect alignment, considering they did not have the magnetic compass at their disposal. The Pyramids' proportions are just as exacting. For example, the greatest difference in the length of the Great Pyramid's four sides at its base, which are about 750 feet long, is less than two inches.
As you scroll along this image, which was shot from the desert a few miles south of the Pyramids, notice how the three structures—those of Menkaure, his father Khafre, and his grandfather Khufu—eventually line up perfectly along their righthand edges.