Poland's first Functionalist Catholic church, Leon Dietz d’Army and Jan Zarzycki's breathtakingly simple design is worthy of further investigation. Built between 1930 and 1933, the plain exterior, which can also claim to have the only single corner tower on any church in the city, hides a sumptuous Art Deco interior including some fine sculptures, pews, lamps and stained glass. The church is also notable as being Katowice's official garrison church. Contact the church beforehand by phone if you'd like to visit as it is usually closed when there aren't masses. FYI - the Church is undergoing a massive renovation until the end of September so visitations aren't recommended during this time.