Within the northern city limits is the famous Basílica of Guadalupe -- not just another church, but the central place of worship for Mexico's patron saint and the home of the image responsible for uniting pre-Hispanic Indian mysticism with Catholic beliefs. It is virtually impossible to understand Mexico and its culture without appreciating the national devotion to Our Lady of Guadalupe. The blue-mantled Virgin of Guadalupe is the most revered image in the country, and you will see her countenance wherever you travel. This is also one of the most important religious sites for Catholics.

The Basílica occupies the site where, on December 9, 1531, a poor Indian named Juan Diego Cuauhtlatoatzin reputedly saw a vision of a beautiful lady in a blue mantle. The local bishop, Zumárraga, was reluctant to confirm that Juan Diego had indeed seen the Virgin Mary, so he asked the peasant for evidence. Juan Diego saw the vision a second time, on December 12, and when he asked the Virgin for proof, she instructed him to collect the roses that began blooming in the rocky soil at his feet. He gathered the flowers in his cloak and returned to the bishop. When he unfurled his cloak, the flowers dropped to the ground and the image of the Virgin was miraculously emblazoned on the rough-hewn cloth. The bishop immediately ordered the building of a church on the spot, and upon its completion, the cloth with the Virgin's image was hung in a place of honor, framed in gold. Since that time, millions of the devout and the curious have come to view the miraculous image that experts, it is said, are at a loss to explain. So heavy was the flow of visitors -- many approached for hundreds of yards on their knees -- that the old church, already fragile, was insufficient to handle them. An audacious new Basílica, designed by Pedro Ramírez Vazquez, the same architect who designed the breathtaking Museo Nacional de Antropología, opened in 1987.

The miracle cloak hangs behind bulletproof glass above the altar of the new Basilica. Moving walkways going in two directions transport the crowds a distance below the cloak. If you want to see it again, take the people-mover going in the opposite direction; you can do it as many times as you want.

In 2002, the pope declared Juan Diego a saint, a very big deal in this predominantly Catholic country; he was the first Mexican to achieve sainthood. The achievement was not, however, without controversy -- Juan Diego's images have increasingly taken on a "European" appearance, and native Mexicans insist that Juan Diego be portrayed as the dark-skinned indigenous peasant he was.

To the right of the modern basilica is the Old Basílica, which used to house the cloak. To the back of it lies the entrance to the Basílica Museum, with a very good display of religious art in restored rooms. One of the side chapels, with a silver altar, is adjacent to the museum. Nearby are several gift shops specializing in religious objects and other folk art.

Outside the museum lies a garden commemorating the moment Juan Diego showed the cloak to the archbishop. Numerous photographers with colorful backdrops gather there to capture your visit on film. At the top of the hill, behind a third basilica built in 1950, is the Panteón del Tepeyac, a cemetery where big names such as Santa Anna and Velasco are buried. The climb up the steps, though potentially tiring, is worthwhile for the view from the top.

If you visit Mexico City on December 12, you will witness the grand festival in honor of the Virgin of Guadalupe. The square in front of the basilica fills with the pious and the party-minded as prayers, dances, and a carnival atmosphere attract thousands of the devout. Many visitors combine a trip to the basilica with one to the ruins of Teotihuacán, as both are out of the city center in the same direction.