The ancient structure built as a tomb for the pharaoh Khufu is the Great Pyramid of Giza. Constructed around 2580-2560 BCE during the Fourth Dynasty of Egypt, it is the largest of the three pyramids on the Giza plateau and was originally 146.6 meters tall, although it now stands at 138.8 meters due to the loss of the outer casing stones. The pyramid exemplifies the architectural prowess of ancient Egyptians, featuring a complex internal structure and precise alignment with cardinal points. It served as a testament to Khufu's power and the religious beliefs surrounding the afterlife in ancient Egyptian culture.