Billed as the largest castle in Europe, this is the primary reason why Figueres became the prominent town in the region as it acted as the commercial base for the castle which was built in the mid 18th century. It has a long history of being a prison (ironically from the North side, you can see the new provincial prison across the highway), as well as being occupied by Napoleon's forces. Visiting it is a pleasant 10 minute walk straight up from the Dalí Museum. Walking around the perimeter of the castle is a flat, 3km walk that gives a splendid view over the Empordà Plain out to the sea. Locals regularly come up to castle to walk or run around it as it is free to walk around and always 'open'. The interior is also viewable with hours that change depending on the season of the year and reasonably priced (€3 for an adult with free audio guide). Additionally there is a café inside the castle for those looking to relax.