Pyramids of Giza are three 4th-dynasty pyramids erected on a rocky plateau on the west bank of the Nile River near Giza in northern Egypt. In ancient times they were included among the Seven Wonders of the World. The Great Pyramid of Giza stands on the northern edge of the Giza Plateau, located about 10 miles west of Cairo. It is composed of over 2 ½ million blocks of limestone, which weigh from 2 to 70 tons each. Around the base of the great pyramid were four smaller pyramids, three of which still stand today. The Great Pyramid of Giza is the most substantial ancient structure in the world. The second largest pyramid was built for Khufu’s son, Khafra (also known as Chephren). In addition to the usual parts of a pyramid complex, Khafra’s pyramid is guarded by a huge sphinx.