Children play on the massive Pyramid of the Sun at Teotihuacan, Mexico. In the first Millenium CE, Teotihuacan was the largest city in the Americas.
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. *ref - Wikipedia
It is one of the major archaeological tourist attractions in Mexico.