UNESCO Themes - Castles & Palaces   The castles and palaces on the UNESCO list of World Cultural Heritage embody both magnificent royal splendour and elegance and impenetrable strength and fortitude: the Prussian Palaces and Gardens in Berlin and Potsdam, the Augustusburg and Falkenlust Palaces in Brühl, the imposing Wartburg Castle in Eisenach and the episcopal Residenz Palace in Würzburg.