The Basilica of the National Shrine of the Immaculate Conception is one of the destinations visited by Pope Francis during his visit to Washington D.C., the capital of the United States of America.
It is not just a church but a real sanctuary with an attached Catholic University. It can be reached in 10 minutes by underground from the city center and is worth a visit. In the United States, it is the largest Roman Catholic church. It is also one of the ten largest churches in the world. This church is dedicated to the patroness of the United States of America, Blessed Virgin Mary, the Immaculate Conception.