The church of St. Servatius is dedicated to Saint Servatius of Tongeren and Saint Denis and is a significant Romanesque building. Construction of the three-naved basilica on the remains of three predecessor buildings began sometime before 997 and finished in 1021. A fire in 1070 caused severe damage. The building was rebuilt in its previous form, and was rededicated in 1129 in the presence of Lothar III. The church contains the architectural feature known as the niedersächsischer Stützenwechsel.