Book excerpt: Massive pyramids tower over the Giza Plateau near Cairo, Egypt. Built in the Bronze Age, these immense stone structures were engineered with remarkable precision. How did the ancient Egyptians construct them without the use of modern tools? Why were they built? Throughout the centuries, historians and archaeologists have studied the pyramids and other Egyptian artifacts in search of possible answers to these questions. The pyramids are filled with mysterious doors and passageways—what other secrets and treasures might lie inside? Find out more about the myths, science, and technology surrounding the creation and exploration of the Egyptian pyramids.