Formerly belonging to the Franciscan monastery, the Church of the Holy Trinity was built at the end of the 15th century, when the Gothic style had already reached its late decorative stage. After St Mary's Church it's the largest in town, with a spacious and lofty whitewashed interior topped with a superb, netlike vault. Note the high altar's assembly of panels from triptychs of different origins, the old tombstones paving the floor, and the spidery Baroque chandeliers from the mid-17th century.