It is not known with any certainty when Dill castle was built, but it is assumed that this happened in the 11th century, and that it might have been built on the ruins of an earlier Roman or Celtic complex.
At the complex's highest point, in the north, is the Oberburg (“upper castle”). Not much of the four-floor residential tower, whose sides measured 18 × 12 m, is left other than three outside walls; the east wall is missing. On the north wall's outer side is a garderobe. Parts of the barrel-vaulted cellar may still be visited. West of the upper castle, remnants of the girding wall have been unearthed. They exhibit a herringbone pattern in their construction.
On the area of the Niederburg (“lower castle” or “bailey”) to the east stand an Evangelical church, built on the spot where the castle chapel once stood, a wellhouse, which has been expanded into a holiday home, and a modern house.
Of the Vorburg (“forward castle” or perhaps “outer bailey”) to the west and south, only remnants of the foundations and outer wall can still be found. Part of the area is used as a garden.
The castle is in private ownership and normally cannot be visited. However, once or twice a year, there are guided tours. The times are published.
References:Château de Niort is a medieval castle in the French town of Niort. It consists of two square towers, linked by a 15th-century building and dominates the Sèvre Niortaise valley.
The two donjons are the only remaining part of the castle. The castle was started by Henry II Plantagenet in the 12th century and completed by Richard the Lionheart. It was defended by a rectangular curtain wall and was damaged during the Wars of Religion. In the 18th century, the castle served as a prison.
The present keeps were the central point of a massive fortress. The southern keep is 28m tall, reinforced with turrets. The northern tower is slightly shorter at 23m. Both are flanked with circular turrets at the corners as well as semicircular buttresses. Each of the towers has a spiral staircase serving the upper floors. The Romanesque architecture is of a high quality with the dressed stones closely jointed.