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" It is not simply the fact that 2.3 million blocks of stone were used to build a pyramid that covers more than 13 acres of land. After all, a few modern engineers have claimed that they, too, could create such a massive structure, given enough time and money. But it is the precision of the pyramid that is so astonishing. It is easy to forget that it originally had an outer casing of white limestone blocks, perfectly polished and fitted. For thousands of years, the structure looked like a brilliant, white, gleaming beacon, unlike any other structure in existence. It required an earthquake to shake the limestone blocks loose, after which the local inhabitants removed most of them to build the city of Cairo. A few of those blocks remain today. They average a massive sixteen tons each, yet the fine "
― Richard M. Dolan , UFOs for the 21st Century Mind: A Fresh Guide to an Ancient Mystery