Constitution Square, or as it is called Mexicans, Zocalo, is the historic heart of the Mexican capital. The first stone of the area laid Hernán Cortés in 1520. It is composed of the ruins of temples and palaces of the ancient city of Tenochtitlan Aztecs. He was on a small island in the middle of the lake. Building it deteriorated over time because of the swampy terrain. At the site of the city is now Mexico City.

At the site of the Aztec palace now houses the National Palace, this eastern side of the Constitution Square. The palace was once the residence of the governor of the King of Spain. Now here is the office of the president and the entire administration. The building has a museum dedicated to the biography of Benito Juarez. Inside the palace walls painted paintings on historical themes, their author - Diego Rivera.

The square is also the Cathedral, which is recognized as the oldest Christian structure throughout America. There was once an altar that contained the remains of victims of the offering to the gods. Construction of the cathedral lasted until 1813, a period of thirty years.

To the east of the cathedral are the ruins of the main temple of the Aztecs. Most of the buildings restored. During the renovation there were found many artifacts and objects of everyday life of the ancient people who joined the collection of the local museum.

From the square depart the central streets of the capital, which are located along the old mansions of the colonialists. In the center is a flagpole with the flag of Mexico. On September 15, Mexico's Independence Day in the Plaza of the Constitution extends the main part of the celebration.