Basilica of the National Shrine of the Immaculate Conception

The Basilica of the National Shrine of the Immaculate Conception is a Catholic minor basilica and national shrine in Washington D.C. It is the largest Catholic church building in North America and the tallest habitable building in Washington, D.C. Its construction, in the Neo-Byzantine and Romanesque Revival styles, began in 1920. The church is dedicated to the Immaculate Conception, the United States' principal patroness.

Source: Wikipedia — Basilica of the National Shrine of the Immaculate Conception (CC BY-SA 4.0)