A Romanesque Fru Alstad church was built in the 12th century, and later it was rebuilt to a magnificent Gothic style temple. The church was originally a pilgrimage church and below the cemetery are still remains from a spring made for sacrifices. The baptismal font is made of sandstone and descends from the 1100s. The triumph crucifix and mural paintigs date from the 1400s, altar from 1689 and pulpit from 1730s.
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.