The Washington National Cathedral has a larger seating capacity of up to 4000, while the Basilica of the National Shrine of the Immaculate Conception has 3,500.
Washington National Cathedral, also called Washington Cathedral, officially Cathedral Church of St. Peter and St. Paul, in Washington, D.C., Episcopal cathedral chartered by the U.S. Congress in 1893 and established on Mount St. Alban (the highest point in the city) in 1907. Its cornerstone was laid by President Theodore Roosevelt. Although construction slowed during periods of economic hardship and stopped altogether during 1977–80, the building was completed in 1990.
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.
Fulfilling its mission, the Basilica is a place of worship, pilgrimage, evangelization and reconciliation.
Check out the world's largest churches featured at The Telegraph.