The Great Pyramid at Giza Egypt is the largest stone building ever constructed on Earth. The Great Pyramid is located at the center of the land mass of Earth. The architect(s) had advanced science and geography data and knew the size and shape of the continents on a global scale. The basic dimensions of the Pyramid also include measurements of the size and shape of the Earth. In the period 3000 - 2500 BC man did not have the tools or knowledge necessary to build the pyramids. Who built the pyramids? Aliens or men? The best answer is: aliens (angels) and men.