The Great Pyramid is the largest and oldest of the three pyramids of Giza. It is the oldest of the Seven Wonders of the Ancient World, and the only one to remain largely intact. Originally at 480 ft tall the pyramid remained the tallest man-made structure in the world for over 3,800 years.
The accuracy of the pyramid’s workmanship is such that the four sides of the base have an average error of only 58 millimeters in length. The Great Pyramid consists of an estimated 2.3 million limestone blocks which most believe to have been transported from nearby quarries. The largest granite stones in the pyramid, found in the “King’s” chamber, weigh 25 to 80 tonnes.