The Pyramids at Giza still stand asperhaps the most remarkable feat of construction, engineering, and sheer organization of labor from the ancient world.The monuments, which required the energies of thousands of masons, craftsmen, laborers, and slaves, were constructed using simple tools of copper, stone, wood, and rope.The largest of all the Egyptian pyramids, the Great Pyramid of Khufu at Giza, erected between 2551 and 2528 B.C., originally rose 481 feet above the desert sand—because of erosion, it now stands at 455 feet. It is composed of some 2,300,000 blocks of limestone, some weighing up to 15 tons.With perfectly sloped sides oriented to the cardinal directions, the Great Pyramid of Khufu is a marvel of precision, intended to stand for eternity. Ancient Egyptian culture was characterized by an obsession with the afterlife; they believed in reincarnation as long as the body was prepared correctly. When an important person died, embalmers quickly renderedcorpse as a mummy, which was then placed in a coffin and buried in one of the tomb's rooms full of treasures to be used in the afterlife. The walls were painted with prayers and spells for protection, the deceased being received by important gods and goddesses. If judged worthy, the deceased would be reborn the next morning with the sun god Re.