metro tlatelolco is a metro station along line 3 of the mexico city metro. it is located in the tlatelolco neighbourhood of the cuauhtémoc borough of mexico city, to the north of the downtown area. it serves the unidad habitacional nonoalco-tlatelolco mega apartment complex, famous for its plaza de las tres culturas square (with buildings from the pre-hispanic, colonial, and modern eras) and infamous for the 1968 tlatelolco massacre of demonstrating students.