The Electoral Castle, with its solid construction and bulky tower, forms the townscape and portrays the power of its builder, the Archbishop and Elector of Trier. The castle had many purposes. It was a fortification to keep enemies out, a stronghold to keep the Boppard nobles at bay and a toll castle for collecting toll from the ships passing Boppard and filling the Elector’s pockets.
Like most castles along the Rhine, Boppard’s Alte Burg was often destroyed and experienced many changes throughout the centuries. The following all have found a home in the castle: customs office, the town gendarmerie, police station, courthouse, prison and military hospital. For the last hundred years it has also been home to the town’s museum with a large collection of Thonet furniture (since the 1970’s). Of special interest are the frescos in the former castle chapel dating 2nd half of the 14th century.
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.