> Indeed; this is why we moved on from piling rocks in a formation that didn't fall down easily, and put all those things you list into cathederals, hydroelectric dams, the Apollo missions, etc.

Several hours later, I realise we have many things which would seem like much more impressive versions of the pyramids, in the event of the collapse of industrial civilisation followed by a second renaissance and future archeological digs looking at us as we looked upon the tombs of Tutankhamen: artificial hills made by covering landfill likely contain a lot more precious metal than a pharaoh's tomb.