Because of the lack of modern technology available to ancient Egyptians, the creation of the pyramids has long baffled archaeologists. No one knows for sure just how the Egyptians hoisted the nearly 2.3 million stones (weighing an average of 2.5 tons each) into place for the Great Pyramid.
Egyptians used the three largest pyramids as tombs for three pharaohs, known as Khufu, Kafhre and Menkaura.
Although Kafhre's burial place appears bigger, the Great Pyramid is actually the largest pyramid. It stands at 455 feet tall (although it was closer to 480 feet at its creation) and its base takes up nearly 9 acres.
The pyramids are located in the Valley of Giza, just across the Nile River from Cairo, which is Egypt's capital.
The Great Pyramid stood as the world's tallest man-made structure for more than 3,800 years.
