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"The Trinity Dome is the central and largest dome of the National Shrine. This 'Crowning Jewel' will be adorned in mosaic according to the original iconographic scheme of the Great Upper Church and will depict the Most Holy Trinity, the Blessed Virgin Mary as the Immaculate Conception, and a procession of saints who have an association with the United States and the National Shrine." -- Courtesy of Trinity Dome at America's Catholic Church