The Great Pyramid of Giza (also known as the Pyramid of Khufu or the Pyramid of Cheops) is the oldest of the Seven Wonders, and the only one to remain largely intact.
It is estimated that the Great Pyramid is comprised of more than 2 million limestone blocks weighing from 2 to 70 tons. Originally standing at over 140 meters (481 feet), the Great Pyramid was the tallest man-made structure in the world for over 3,800 years. It was built with such precision that it would be difficult to replicate it even with today’s technology.