Casa Païral, the museum of Roussillon and Catalan folklore, occupies Le Castillet, a 14th-century red-brick town gate. Once a prison, it's the only vestige of Vauban's fortified town walls, which encircled the city until the early 1900s. The museum houses bits and pieces of everything Catalan - from traditional bonnets and lace mantillas to a 17th-century kitchen. From the rooftop terrace there are great views of the old city and citadel.