Pyramids at Giza are the last remaining of the Seven Wonders of the ancient world. The monumental tombs are relics of Egypt's Old Kingdom era and were constructed some 4500 years ago, during a time when Egypt was one of the richest and most powerful civilizations in the world. Egypt's pharaons expected to become gods in the afterlife so they erected massive pyramid tombs for themselves to prepare for the next world. The Giza pyramid complex of ancient monuments includes the three pyramids: Great Pyramid, Pyramid of Khafre, Pyramid of Menkaure. Each massive pyramid is but one part of a larger complex, including a palace, temples, solar boat pits, and other features. There is also the massive sculpture known as the Great Sphinx that may stand sentinel for the pharaon's entire tomb complex.