The Castle of the Teutonic Order in Malbork is the largest castle in the world by surface area. It was built in Prussia by the Teutonic Knights, a German Roman Catholic religious order of crusaders, in a form of an Ordensburg fortress.
Aside from the attractions in Paris, the Mont Saint Michel is the most visited tourist attraction in France. The massive edifice sits on its own island, and not only includes a castle, but an entire city. Read more on Avenly Lane Travel!