The pyramids of giza were built in just under 30 years. "It is in the city of Cairo, and is the last survivor of the Seven Wonders of the World." Giza's three pyramids and the Sphinx were made in the fourth dynasty of Egypt's Old Kingdom, Possibly the first great civilization on earth." "About 2,550 B.C., King Khufu, the second pharaoh of the fourth dynasty, started the building of his tomb at Giza. "Some scientists belived that it took up to 25 years to build. The pyramids sides faced the true north, south, east, and west. The pyramids were mostly made of limestone block moved by men and set into place.
