Thousands of Mexicans celebrate spring at Teotihuacan Thousands of Mexicans and tourists made their way to the summit of the Pyramid of the Sun on Thursday, at Teotihuacan in Mexico, to fill themselves with cosmic energy during the spring equinox. The site is famous for its two enormous payramids, of the sun and of the moon. This pre-Hispanic city, built around 100 B.C., is thought to have had around 200, 000 residents, making it one of the five biggest in the world at its height. Images and soundbites.