Erected starting in 1352 St. Petri Church belonged to the parish of the new town-based Teutonic Order. Today’s shape goes back to extensive modifications carried out between 1893 and 1895 when the nave’s arching ceiling was restored and extended towards the west, and the façade was renewed. A memorial chapel was built into the northern aisle in 1927, dedicated to the victims of the First World War. The monument in front is named “Indignant Christ”. It is considered the most important work by the Mühlhausen-based sculptor Walter Krause (1891-1967). St. Petri is an open church on the pilgrimage route from Loccum to cloister Volkenroda.