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  Great Pyramid of Giza / Pyramid of Khufu / Cheops.

Khufu's Pyramid is estimated to contain over two million blocks of stone weighing on average around 2.5 tons, with some stones at the base weighing as much as 15 tons. Until the 19th century it was the tallest building in the world. Yet for such a vast structure the precision is amazing - the greatest difference in length between the four 756-ft. sides is only 2 inches.
   

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