Built on top of the capital of the Aztec empire, Tenochtitlan, Mexico City's Metropolitan Cathedral exemplifies the dynamic nature of a city and nation influenced by its indigenous and colonial histories. The Cathedral complex is the seat of the Roman Catholic Archdiocese of Mexico and composed of four buildings: the cathedral, the sagrario or sacristy, the Capilla de las Animas, and the Ex curia building. The expansively ornate cathedral draws visitors from around the world and remains an active religious center for Mexicans today.