The impressive, towering cathedral, begun in 1567 and finished in 1788, blends baroque, neoclassical, and Mexican churrigueresque architecture. As you look around the cathedral and the Sagrario (chapel) next to it, note how the building has sunk into the soft lake bottom beneath. The base of the facade is far from level and straight, and when one considers the weight of the immense towers -- 127,000 tons -- it's no surprise. Scaffolding has become almost a part of the structure, in place to stabilize the building. However, much to the credit of Mexico City and its preservation efforts, the Catedral Metropolitana came off the World Monuments Fund's list of 100 Most Endangered Sites in 2000, as a result of an extensive reconstruction of the building's foundation.

In Mexico, the sacred ground of one religion often becomes the sacred ground of its successor. Cortez and his Spanish missionaries converted the Aztec, tore down their temples, and used much of the stone to construct a church on the spots of the temples that preceded it. The church they built was pulled down in 1628 while the present cathedral was under construction. The building today has 5 naves and 14 chapels. As you wander past the small chapels, you may hear guides describing some of the cathedral's outstanding features: the tomb of Agustín Iturbide, placed here in 1838; a painting attributed to the Spanish artist Bartolomé Esteban Murillo; and the fact that the stone holy-water fonts ring like metal when tapped with a coin. Like many huge churches, it has catacombs underneath. The much-older-looking church next to the cathedral is the chapel known as the Sagrario, another tour de force of Mexican baroque architecture built in the mid-1700s.

The Catedral Metropolitana contains many prized works of colonial art in a variety of artistic styles. Jerónimo de Balbas built and carved the Altar de los Reyes (Altar of Kings) and the Altar del Perdón (Altar of Forgiveness) in 1737. For a small donation, a tour of the towers is available (sign up inside the cathedral near the entrance).

As you walk around the outside of the cathedral, you will notice a reminder of medieval trade life. The west side is the gathering place of carpenters, plasterers, plumbers, painters, and electricians who have no shops. Craftspeople display the tools of their trades, sometimes along with pictures of their work. In front of the cathedral, you can buy crystals, gemstones, and herbs, believed to provide special qualities of protection and cure from various afflictions.

Visitors are asked not to tour the cathedral during Mass.