Nothing inspires more awe about the great ancient Egyptian civilization than the Great Pyramid at Giza. It was built over 4,600 years ago as an eternal house for King Khufu's body after death. By most estimates, over 2.3 million limestone blocks were used to construct this magnificent monument. The blocks were of varying sizes, some weighing as much as 20 tons. At an initial height of 147.5 meters, the Great Pyramid remained the tallest man-made structure anywhere in the world for over 3,800 yea