The unsolved mystery of the Egyptian pyramids

The pyramids are tombs built by the kings of ancient Egypt for themselves. The pyramids in Egypt are considered as one of the seven wonders of the ancient world. Most of the pyramids in Egypt were built in the third to sixth dynasties. These pyramids with a history of more than 4,000 years are mainly distributed in the capital Cairo and Giza on the west bank of the upper Nile.

Eighty pyramids have been discovered in Egypt. The most spectacular pyramid was built around 2600 BC, all of which were built by human beings. How did the ancient Egyptians carve stones and build tombs? The layout of the passages and rooms inside the tomb is like a maze. How did the ancient Egyptians design it? The ventilation pipes of the mausoleum incline to the deep underground, the stone walls are smooth, and exquisite and gorgeous reliefs are carved, but no one can understand why the ancient Egyptians mastered such exquisite excavation and carving skills and used what processing tools. You know, 4,500 years ago, at that time, people had not mastered iron.