The Castle Amerongen was built in 1673 on the site of a previous stronghold that had been burned by the French troops during the invasion of 1672. The current building was designed by the architect Maurits Post as a baroque palace for the owners Godard Adriaan van Reede and his wife Margaretha Turnor. In the main hall a central staircase with painted ceiling was built by Willem van Nimwegen. Other ornaments were added in the early 20th century by P. J. H. Cuypers. The gardens contain historical elements and the walls predate 1673.
Near the entrance bridge dating from 1678 is a wooden clock tower from 1728 that contains the original clock of the same date. In the north-east corner of the gardens is an orangerie dating from the 1880s, and the north wall was raised during the period when Wilhelm II was residing there 1918-1920. He abdicated in Amerongen then moved to Huis Doorn.
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.