[wendy1946]

There’s more to this sort of story, and in fact reasons to think that the Egyptians had technologies beyond ours for dealing with stone. They had vases made of diurite, which is terribly hard, which nobody could produce with bronze tools. Some people, particularly a French scholar named Davidovitz, believe they had the technology to liquify and pour hard stone and that, if this technology could be rediscovered, we’d be looking at highways which never needed to be repaired.

[MHGinTN]

The box which held the Pharoah’s sarcophagus in Kufu’s pyramid was a nice rectangular shape supposedly ‘carved’ out of diurite. Yet the drilling/shaping method is an impossibility for the technology of that day. The box was likely poured and hardened.