La Plaza de la Constitución, informally called El Zócalo, is the main square in Mexico City. Located in the historic center of Mexico City, it is one of the largest squares in the world.
Plaza de la Constitución has been the center of Mexico City since pre-Hispanic times, when the Templo Mayor of Tenochtitlan rose in what today is Seminario Street, at the right of the Metropolitan Cathedral and Sagrario. When the Spanish built Mexico City over the ruins of Tenochtitlan in the colonial era, all the streets were developed from the orientation of the Plaza Mayor.
View a video of the Zocalo on Google Maps