The Great Pyramid of Khufu (Cheops) is one of the largest structures built by man even today, 4,500 years later. It is estimate that 2.3 million blocks averaging 2.5 tons a piece were used in the building the pyramid. Weight of the block ranged from 2 to 15 tons. The pyramid sits on 13.5 acres of land and is a height of 480 feet. The length of its sides are 756 feet. It is estimated to have taken 100,000 men over 25 years to build the pyramid.
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