The Château Royal de Collioure sits directly on the harbour, its feet practically in the sea, a massive fortification whose scale feels slightly absurd in such a small town. The castle complex includes the original medieval core, the Aragonese expansion with its round towers, and Vauban's 17th-century modifications that gave the walls their current profile. The views from the battlements take in the harbour, the church, the beaches on either side, and the mountains behind.
The interior is open to visitors and contains a museum covering the castle's history and the town's past as a major trading port of the Crown of Aragon. The Aragonese connection explains why Collioure feels so different from the rest of southern France: for three centuries it was culturally and politically Catalan, and that heritage still shows in the architecture, the food, and the language of many residents.