What did you find most interesting in describing the ancient Egyptian pyramids?

What is very interesting about all the pyramids is that they are quite complex. The pyramid of Cheops is impressive. Interestingly, no one knows for certain when and by whom it was built. There are only assumptions. The scale of construction is impressive. The height of the pyramid is about 136 meters, which was phenomenal at that time. No wonder she is included in the “Seven Wonders of the World”. It is interesting to know that the side walls have a concavity on the outside. And no one can substantiate this fact with certainty. The pyramid has a rather complex internal structure and underground rooms. What functions were performed by some of the rooms of the pyramid and the underground part remains a mystery.