Chichen Itza is a large pre-Columbian city built by the Maya civilization.

Uxmal is an ancient Maya city of the classical period located in present-day Mexico.

Calakmul is a Maya archaeological site located in the Mexican state of Campeche, deep in the jungles of the greater Petén Basin region.

Palenque is a Mayan city state in southern Mexico that flourished in the 7th century.

El Tajín is a pre-Columbian archaeological site located in the state of Veracruz, Mexico.

Monte Albán is a large pre-Columbian archaeological site located on a low mountainous range in the Mexican state of Oaxaca.

Teotihuacan is an ancient Mesoamerican city located in a sub-valley of the Valley of Mexico.

Xochicalco is a pre-Columbian archaeological site located in the Mexican state of Morelos.

The Barbarastollen is the central German archive for securing valuable books and documents from possible loss.

The Vatican City is an independent city-state enclaved within Rome.