It is the most complete and elaborate example of a Gothic brick-built castle complex in the characteristic and unique style of the Teutonic Order. This spectacular fortress bears witness to the phenomenon of the Teutonic Order state in Prussia. Criterion (iv): Malbork Castle is an outstanding example of the castles of the Teutonic Order, which evolved on the frontiers of medieval western Europe. IntegrityThe boundaries of the 18 ha Castle of the Teutonic Order in Malbork encompass all the elements necessary to sustain the Outstanding Universal Value of the monumental castle complex, characterised by a tripartite layout comprising the High Castle, the Middle Castle, and the Outer Bailey, each clearly delineated while at the same time integrally interconnected. Other equally important attributes of Malbork, illustrating its significance as the seat of the Grand Masters of the Teutonic Order, are individual buildings of the castle complex.