The document discusses the Great Pyramid of Giza in Egypt. It was built around 2570 BC and was the tallest man-made structure for over 3,800 years until the Lincoln Cathedral was constructed. The pyramid was ordered built by Pharaoh Khufu and constructed by his vizier Hemiunu using an estimated 2.3 million stone blocks. There are two main theories for how it was built - that slaves were used or that highly skilled paid workers completed the massive project.