But you know, the Great Pyramid of Khufu is one hell of a barn. NOVA: Some of the theories of who built the pyramids suggest that the builders may not have been from Egypt. Can you respond to that?

Bradley Walsh has said he thought he was “going to prove” the Egyptian pyramids were built by aliens in his new television show.

Builders of Egypt’s oldest known pyramid, the nearly 4,700-year-old Step Pyramid of Djoser at Saqqara, may have used waterpower to help construct this monumental structure.

It was divided into seven palms, and each palm was divided into four fingers. The pyramid builders must have measured incredibly accurately. There is only a few centimetres' difference in length ...