The Catholic parish church of St. Martin in Langenargen on Lake Constance is located directly at the harbour in the immediate vicinity of Montfort Castle, which is well worth seeing. The baroque church was built between 1720 and 1722 under Count Anton III and consecrated by the Prince-Bishop of Constance, Johann Franz von Stauffenberg. The originally planned construction of two towers could not be realised for financial reasons. In 1735, the north tower was finally built. Between 1789 and 1986, the church was rebuilt several times and adapted to the times. In 1891, for example, the old bull’s eye windows were replaced by stained glass windows. A highlight for visitors are the regular organ concerts.