The Great Sphinx of Giza was carved from limestone during the reign of Pharaoh Khafre around 4,600 years ago and stands guard behind Khafre's pyramid. The Egyptians built pyramids as tombs for pharaohs and their queens starting before the Old Kingdom, with the three largest at Giza constructed over three generations for Khufu, Khafre, and Menkaure. While it was once believed that slaves built Khufu's pyramid, it was actually constructed by 100,000 workers during the Nile's annual flooding. The Pyramid of Saqqara was the first to be built out of stone blocks rather than mudbrick and served as the prototype for later