As the only survivor of the Seven Wonders of the Ancient World, the Pyramids of Giza are extraordinary in their own right. Built some 4,500 years ago to endure an eternity, these monumental tombs and elaborate complexes are relics of Egypt’s Old Kingdom era. Even today, scientists and archaeologists can’t be sure how they were constructed, but we do know that the 100,000 noble craftsmen were highly skilled and that this became a project to display the wealth and control of the ancient pharaohs.