The ancient Mexican city known for the Pyramids of the Sun and Moon is Teotihuacan, a UNESCO World Heritage Site.
Teotihuacan developed in the Valley of Mexico and became one of the largest cities in the ancient Americas. Its monumental core is organized around the Avenue of the Dead, with the Pyramid of the Sun, Pyramid of the Moon, Temple of the Feathered Serpent, palaces, plazas, and residential compounds. Construction and expansion took place mainly between the first and seventh centuries CE.
The city’s original name and the identity of its ruling population remain uncertain. The name Teotihuacan comes from the later Nahuatl-speaking Aztecs, who encountered the ruins centuries after the city was abandoned. It is therefore not an Aztec-built city, and it should not be confused with Maya sites such as Palenque or Chichen Itza. UNESCO inscribed the pre-Hispanic city in 1987.