The Great Pyramid called Tiachihualtepetl ("handmade hill") is the largest prehispanic structure in the world in terms of volume, it covered an area of more than 1,300 feet on each side and it was 213 feet height without counting the height of the temple at the top.

The pyramid was built for the god Chicomenaquihuitl (nine rains) and it was covered with a thick coat of stucco painted with bright colors and decorated with symbolic designs.

In the top there were as many as seven temples, each one with its own plinths, stairs and corridors. Today there are some remains of the façade of one these buildings and it is decorated with a very well preserve painting representing a ritual ceremony and it is known as the “Mural of the drinkers”.

On each side of the great pyramid, there were open spaces bordered by elegantly decorated buildings. The one in the southern plaza is known as the “courtyard of altars”, considered one of the most spectacular places, where buildings, altars and stelae are engraved, similar to those of El Tajín, all distributed in great harmony.

You can visit about 8 km of tunnels that allow the observation of the different phases of construction.