What is the most important Catholic Church in the United States?
A word of welcome to the Basilica of the National Shrine of the Immaculate Conception — America's Catholic Church.
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St.John Lateran is the most important of them all, because it is the home of the bishop of Rome, the Pope. Pope Francis lives in Vatican City, and performs mass more often at Saint Peter's Basilica than at the other papal basilicas, but St. John Lateran is the Pope's church in Rome.
The Basilica of the National Shrine of the Immaculate Conception is the largest Roman Catholic church in the United States and North America, and is one of the ten largest churches in the world.