The Castle of Valderrobres stands in the upper part of the town. Its origins date to the late 12th century and it is one of the earliest Gothic fortresses in Aragón. The building displays a series of features typical of Gothic civil and military architecture found throughout the Crown of Aragon. Among its rooms, the most notable are the Stables Hall, the Chapter House, the Fireplace Room, a large kitchen, the Lions' Room and the Golden Chamber. The floor plan of the enclosure is an irregular hexagon, adapted to the terrain on which it sits. It was declared a National Monument in 1931. The Church of Santa María la Mayor forms an inseparable ensemble with the castle, presiding over the highest point of the old town and together commanding the whole valley in which the municipality is set. This church follows the Gothic style of the Crown of Aragon, based on a hall plan, with an apse of the same width as the nave and side chapels between the buttresses. The portal is treated as an individual element and presents a splendid appearance, enhanced by the superimposed rose window that crowns it. The Museum and Interpretation Centre of Valderrobres opened its doors in 2015. This museum is a multidisciplinary space where visitors can find information about the town and its surroundings, permanent exhibitions by private collectors who have donated their works or collections to Valderrobres, and exhibitions retracing the history of Valderrobres and its people through the centuries. The space can be visited throughout the year, either individually or on a guided tour.