Ganthem church is a well-preserved Romanesque church, finished in the middle of the 13th century. The choir with its apse is the oldest part, dating from the late 12th century. The nave is slightly later, from the beginning of the 13th century while the tower is the most recent addition. Apart from an enlargement of the windows made in the 19th century, and the addition of a sacristy in the 1930s, the church has remained unchanged since the 13th century.
The interior of the church is decorated with frescos from the 15th century. On the northern wall, a set of paintings depict the Passion of Christ. This set is unusual inasmuch as it has never been painted over, and has retained much of its original vibrancy. On the southern wall, another set of frescos depicts other religious motifs.
The church still contains a number of medieval items. The baptismal font is from the latter half of the 14th century and has been ascribed to the artist Hegvald. The triumphal cross is from circa 1200 and unusually well-preserved. The altarpiece is furthermore a copy of the original, 14th-century altarpiece now belonging to the Swedish History Museum.
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.