Had to have a smile when you mentioned Malbork (incidentally that is not an "l", it has a little line through it and has a "w"-"v"ish sound. Perhaps the easiest to remember is Schneidemuhl which is now Pila with little line through "l", pronounced roughly Piwa). Marienburg was the seat of the Teutonic knights and the largest brick-built fortress in Europe - absolutely vast, google up a picture. As you go in there is a photo of what it looked like when the Germans retreated in front of the Red Army. Because of the symbolism they had literally fought to the last brick and this great famous fortress was just that - a heap of broken bricks. It has now been restored, by the Poles, in every detail to exactly what it was like when it was the world symbol of the power of the Teutonic knights - apart from the domestic outbuildings which have been turned into a very nice hotel. Did someone say something about a mad, mad, world? Really worth a visit though. Good luck with your searches.