"When anyone reflects on ancient Egypt today, the Great Pyramid of Cheops and its
staggering dimensions invariably are brought to mind: It stands 481 ft. high and contains 2
million blocks of yellowish limestone. Each block weights 2.5 tons, was quarried miles away,
floated on barges, and dragged from the shores of the Nile to its present site."

A long time ago, I posted about a French chemist named Davidovitz, who specializes in chemistry of such things as cement, who wrote a book which entirely convinced me that the blocks of the Great Pyramid were not quarried and laboriously lifted up hundreds of feet from the river below, but made from a form of something similar to cement, and cast in molds in situ. Unfortunately, few archaeologists believe him.
But I could not find anything improbable in his arguments. If anyone is interested, PM me, and I will try to see if any of his stuff is still on Internet. Unfortunately Yahoo drops things after a few years.