St. Mary's Church, or formally the Basilica of the Assumption of the Blessed Virgin Mary, is a Roman Catholic church in Gdańsk, Poland. Its construction began in 1379, or 1343 according to the official website. With its volume between 185,000 m3 and 190,000 m3 is currently one of the two or three largest brick churches in the world, and one of the two or three largest north of the Alps. Only San Petronio Basilica in Bologna, comprising 258,000 m3 is larger, Munich Frauenkirche and Ulm Minster also comprise 185,000 to 190,000 m3.