All three of Giza’s famed pyramids and their elaborate…

All three of Giza’s famed pyramids and their elaborate burial complexes were built during a frenetic period of construction, from roughly 2550 to 2490 BC. The pyramids were built by Pharaohs Khufu (background), Khafra (middle), and Menkaure (front). Photograph by Cordon Press/National Geographic