The Pyramid of Khufu (Cheops) has been known as an immense impressive structure since ancient times and is the only one of the original seven wonders of the world still in existence. The base of the pyramid measures 230.37m and its height was originally 146.6m, with an angle of slope of 51° 50′ 40”. The structure consists of an enormous quantity of limestone blocks (estimated at around 2,300,000). Dynasty IV, old Kingdom, the Giza Plateau, Giza, Egypt. | Mahmoud Younes - Egyptologist