Exaltations of the Cross Church was built before 1367. The brick Gothic church had three naves and star vaulting. In the 15th century the church was burnt by Hussites and again 1577 it suffered damages in the battle during the Danzig rebellion. Between 1585 and 1945 it was a Lutheran Church and survived from the World War II. Today Exaltations of the Cross Church is a Roman Catholic church. The richly decorated interior is well-preserved, including a Renaissance style pulpit from 1578.
References:Sigmaringen Castle was first mentioned in the year 1077 in the chronicles of Petershausen monastery. The oldest parts of the castle are concealed beneath the alterations made during the 17th and the 19th centuries. The secret of the earliest settlement built on this defendable rock will never be fully revealed: large-scale excavation work would be necessary, which the extensive land development renders impossible. Judging from the many Roman remains unearthed in the area around Sigmaringen, the 12th century keep known as the 'Roman Tower' could be traced back to a Roman predecessor.
The castle remains that have been preserved (gate, great hall and keep) date back to the Staufer period around 1200. The castle remains were integrated into subsequent buildings. The foundations of the castle buildings are to a large extent identical to the surrounding castle wall.
These remains give us a good idea of how the castle might have looked during the 12th century.