The ancient Egyptians built pyramids as tombs for pharaohs and their queens. The three largest pyramids were built at Giza during the Old Kingdom. Pyramids were designed with symbolic meanings, representing the primordial mound the Egyptians believed the earth originated from and the sun's rays. The largest, the Great Pyramid of Giza, was built as a tomb for the pharaoh Khufu and remained the world's tallest building for over 3,000 years. Step pyramids were early pyramid designs, including one built for Pharaoh Djoser. The Great Sphinx is thought to represent Pharaoh Khafra and was later buried by sand until its excavation