Basilica of the National Shrine of the Immaculate Conception

One of the best Catholic Church in Washington DC.
The Basilica of the National Shrine is a National Sanctuary of Prayer and Pilgrimage as designated by the United States Conference of Catholic Bishops.
Designated by the United States Conference of Catholic Bishops as a National Sanctuary of Prayer and Pilgrimage, the Basilica is the nation’s preeminent Marian shrine, dedicated to the patroness of the United States—the Blessed Virgin Mary under her title of the Immaculate Conception. It is oftentimes affectionately referred to as America’s Catholic Church.
Visited by Pope Benedict XVI, Pope John Paul II, Pope Francis,and Mother Teresa, among others, the Basilica, though distinctly American, rivals the great sanctuaries of Europe and the world.