The name Pyramid of the Sun comes from the Aztecs, who visited the city of Teotihuacán centuries after it was abandoned; the name given to the pyramid by the Teotihuacanos is unknown. It was constructed in two phases. The first construction stage, around 100 C.E, brought the pyramid to nearly the size it is today. The second round of construction resulted in its completed size of 357 feet (225 meters) across and 246 feet (75 meters) high, making it the third largest pyramid in the world behind the Great Pyramid of Cholula and the Great Pyramid of Giza. The second phase also saw the construction of an altar atop of the pyramid, which has not survived into modern times. The Adosada platform was added to the pyramid in the early third century, at around the same time that the Ciudadela and Temple of the Feathered Serpent, Teotihuacan Pyramid of the Feathered Serpent were constructed.