The artists who make the mural on the wall of the Upper Castle in Opole are inspired by the graphics included in the book Zeitgeschichte der Staedte Schlesiens (Contemporary History of Silesian Cities). The view of the city was taken from Moritz Hill - now no longer existing, levelled for the needs of the "Odra" Cement Plant, which was built in the adjacent area. The city is therefore visible from the north. You can still see the city walls and the moat filled with water.