The Roman graves are situated high above the municipality of Nehren between vineyards. The tombs, dating from the fourth century AD, were rebuilt on their foundations in 1974. The burial chamber of the first tomb is the only room from antiquity still existing in the Rhineland in which the original painting of the walls and the vault has been largely preserved. It is the family tomb of a landowning family whose residence is to be found in the extensive rubble field that was repeatedly excavated on the terrace directly north above the village of Nehren. The graves were extensively restored in 2002-2005. From here you have a magnificent view of the Moselle valley.
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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.