Gdansk: St. Mary's Church, or formally the Basilica of the Assumption of the Blessed Virgin Mary, is a Roman Catholic Church in Gdańsk. Its construction began in around 1350. It is currently one of the two or three largest brick churches in the world. Between 1536 and 1572, St. Mary's Church was used for Roman Catholic and Lutheran services simultaneously. From the 16th century until 1945, when Danzig became Polish Gdańsk, it was the second largest Lutheran church in the world.