El Zocalo is also known as Plaza de la Constitución, and is a must-see when you visit. It is bordered by the Metropolitan Cathedral, the National Palace, Federal District buildings, and the Old Portal de Mercaderes. It is considered the main square in the city. In the center is a glorious, gigantic Mexican flag, and the square is a gathering place for Mexicans. Many celebrations and parades are held here and have been held here for centuries, as it dates back to the 16th century. We enjoyed getting photos, as this is definitely an important landmark in the city. Highly recommend as a must-see in Mexico City.