Plaza de las Tres Culturas, Public square in Cuauhtémoc, Mexico.

Plaza de las Tres Culturas is a public square in Cuauhtémoc where three building eras meet: pre-Hispanic pyramids, Spanish colonial buildings, and modern Mexican structures standing together. The exposed remains of the Tlatelolco market form the heart of the space, surrounded by church buildings and contemporary architecture.

The square witnessed the final battle between Aztecs and Spanish conquistadors in 1521, marking the end of the pre-Hispanic era in central Mexico. Spanish colonizers then built a church on the site, but older structures remained beneath the surface until they were later partially excavated.

The ruins of the Tlatelolco market, the Church of Santiago, and the modern Cultural Center dominate the space, each representing a different chapter of Mexican life. Walking through, you experience how different societies left their mark on the same ground.

The square is easily reached by the Tlatelolco metro station and is freely accessible during daylight hours. Guided tours are regularly available to explain the archaeological remains and the events that took place there.

The 1967 Treaty of Tlatelolco, which made Latin America a nuclear-weapon-free zone, was signed on this square. Mexican diplomat Alfonso García Robles led the effort and received the 1982 Nobel Peace Prize for it. The stone memorial on the south side, unveiled on 2 October 1993, lists the identified victims of the 1968 massacre and closes with lines from Rosario Castellanos's poem "Memorial de Tlatelolco".