Olstrup Church is a Romanesque church built around 1200. In the Middle Ages, the church was originally dedicated to St Lawrence. Built of red brick, the relatively small church first consisted of a Romanesque chancel and nave. It was later extended to the west in the Late Gothic period with a stepped gable. The chancel's cross-vaults and the round chancel arch may date from the church's original construction. The cross-vaults in the nave also seem to be older than the Gothic extension.
In 1936, Egmont Lind discovered frescos in the east vault of the nave which were dated to c. 1575. They present scenes of the Last Judgment. Christ is depicted sitting on a rainbow with his feet on the globe of the Earth, flanked by trumpet-playing angels and the 12 apostles. Some pre-Reformation features such as the lily and sword are included but there are no halos.
The carved pulpit from 1622 has figures of the apostles. The canopy is from c. 1675. On the north wall there is a figure of St Lawrence from c. 1300. There is a decorated font in Gotland limestone.
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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.