They are the only monument of the Seven Wonders of the ancient world still existing. Built in 26th century BC, the Pyramids of Giza consists of the Pyramid of Khufu (or Cheops also known as the Great Pyramid), the Pyramid of Khafre (Chephren) and Pyramid of Menkaure (Mykerinos). With it's original height of 140 m, it was the tallest building in the world till 14th century AD. The Pyramids of Ancient - Pharaonic Egypt were built as tombs for Kings and Queens. Egyptians were building pyramids during their Old and Middle Kingdoms (2670-1759 BC). Archaeologists till now discovered 118 Egyptian pyramids.