Called the White Dove of the Desert, Mission San Xavier del Bac, an active Roman Catholic church serving the San Xavier Indian Reservation, is a blindingly white adobe building that rises from a sere, brown landscape. Considered the finest example of mission architecture in the Southwest, the beautiful church was built between 1783 and 1797, and incorporates Moorish, Byzantine, and Mexican Renaissance architectural styles. The church, however, was never actually completed, which becomes apparent only when the two bell towers are compared. One is topped with a dome, while the other has none.

Colorful murals cover the interior walls, and behind the altar are elaborate decorations. To the left of the main altar, in a glass sarcophagus, is a statue of St. Francis Xavier, the mission's patron saint, who is believed to answer the prayers of the faithful. A visit to San Xavier's little museum provides a bit of historical perspective and a chance to explore more of the mission. To the east of the church, atop a small hill, you'll find not only an interesting view of the church, but also a replica of the famous grotto in Lourdes, France. There are often food stalls selling fry bread in the parking lot in front of the church.