Dankwarderode Castle was built between c. 1160 and 1175 as the Pfalz of Duke Henry the Lion on an island in the river Oker. Next to the castle, construction of Brunswick Cathedral began in 1173. The castle lost its military significance as a defensive structure early, when it became surrounded completely by the growing city.
During the 15th century, the dukes of Brunswick-Wolfenbüttel moved their Residenz out of the city and to the nearby town of Wolfenbüttel.[1] In 1616 the castle keep was reconstructed in the renaissance style, while the rest of the castle was demolished or left to decay. During the 19th century, the castle keep served as a barrack, plans to demolish it completely were stopped by public protests in 1873. The present structure was rebuilt in 1887 by Ludwig Winter, based on archeological investigations. Today the ground floor of Dankwarderode Castle houses the permanent collection of Medieval objects of the Herzog Anton Ulrich Museum
Castle Biljoen - a " water-castle " in Holland - lies between the Veluwe and the IJssel near Velp. This Noble House from the 16th century was rebuilt by Alexander van Spaen (1619–1692) into the present day castle with four equal corner towers.
