Pyramid of khufu was built in 2560 BC, and its tower height is146.5m. Due to long-term weathering, the top has peeled off by 10m, and now it is136.5m high. The tower is made up of 2.3 million stones, the weight of which ranges from 1.5 tons to 160 tons, and the total weight of the tower is about 6.84 million tons, which is the size of the largest pyramid ever discovered in Egypt 108. It is a human miracle completed by100,000 people in 20 hours. This pyramid was built as a tomb. The ancient Egyptians believed in immortality after death, and the tombs of the pyramids were originally filled with gold and various valuables.