Grimbergen Abbey is a Premonstratensian monastery established in 1128 in the place of an earlier foundation of Augustinian Canons.
The abbey itself was dissolved in 1796 in the aftermath of the French Revolution, but the abbey church of Saint Servatius survived as the parish church of Grimbergen. After the French Revolution the abbey was reinstated. The building in its present form dates from 1660 and is considered one of the most beautiful and best-integrated Baroque churches in the Low Countries. It was elevated to the status of basilica minor in 1999.
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.