The historic center of Mexico City, also known as the Centro or Centro Histórico, is the central neighborhood in Mexico City, Mexico, focused on Zócalo or main plaza and extending in all directions for a number of blocks, with its farthest extent being west to the Alameda Central. The Zocalo is the largest plaza in Latin America. It can hold up to nearly 100,000 people.
This section of the capital lies in the municipal borough of Cuauhtémoc, has just over nine square km and occupies 668 blocks. It contains 9,000 buildings, 1,550 of which have been declared of historical importance. Most of these historic buildings were constructed between the 16th and 20th centuries. It is divided into two zones for preservation purposes. Zone A encompasses the pre-Hispanic city and its expansion from the Viceroy period until Independence. Zone B covers the areas all other constructions to the end of the 19th century that are considered indispensable to the preservation of the area's architectural and cultural heritage.
This is where the Spaniards began to build what is now modern Mexico City in the 16th century on the ruins of the conquered Tenochtitlan, capital of the Aztec Empire.