From about 3500 BC, dozens of small slave countries appeared on both sides of the Nile. About 3 100 BC, an ancient Egyptian country was established. The king of ancient Egypt, also known as Pharaoh, was the largest slave owner in ancient Egypt and had supreme power. They are regarded as the embodiment of God. They built a huge mausoleum pyramid for themselves, which became a symbol of Pharaoh's power.

The pyramids of Egypt are the tombs of ancient Egyptian emperors (pharaohs). One of the seven wonders of the world. They are numerous and widely distributed. The pyramids of Memphis, the ancient city on the west bank of the Nile in the southwest of Cairo, are part of the concentration.

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Pyramid of khufu is built by millions of huge stones. The average weight of each stone is over 2000 kg, and the largest stone is over 100 ton.

It was not easy to mine stones at that time, because people had no explosives and no steel. At that time, Egyptians used copper or bronze chisels to punch holes in rocks, then inserted them into wooden wedges and filled them with water. When the wedge was expanded by water, the rock cracked.

Herodotus, known as the "father of western historiography", once recorded that the stones used to build pyramid of khufu were mined from the "Arabian Mountain" (probably Sinai Peninsula). Most of the stones are mined locally, and the limestone used to decorate their surfaces comes from Tula mining area in Hedong.

Reference source: Baidu Encyclopedia-Ancient Egyptian Pyramids