Tlatelolco is an archaeological site located in Mexico City, known for its significance in the history of the Aztec civilization. It was once a thriving city-state that coexisted with Tenochtitlan, the Aztec capital, and was known for its bustling markets and impressive architecture. Today, Tlatelolco is recognized for its historical importance and is home to the Plaza de las Tres Culturas, which symbolizes the blend of pre-Hispanic, colonial, and modern Mexican cultures. The site also features the Tlatelolco archaeological site, where visitors can explore ancient ruins and learn about the region's rich heritage.