Nidzica Castle, also called "Neidenburg," was built by the Teutonic Knights around 1370 and guarded an important road between the heart of East Prussia and Lithuania. Since the Teutonic Knights were a monastic order, the castle has features typical of a monastery, such as a large chapel in the main building and a covered walkway around the courtyard, similar to a cloister.
Like most medieval buildings in the area, Nidzica Castle was bult in brick because the region doesn't have much stone.
My reconstruction of Nidzica Castle is 35 x 25 inches (112 x 80 studs) and is about 18 inches high.
For more photos of my reconstruction of Nidzica
For photos of the real Nidzica Castle and other source