A narrow spiral staircase winds up all the way to the roof. Up here, the city sounds give way to the wind whistling around the pinnacles of the beautiful Gothic church just behind busy Plaça Cort. Lofty, but not so high above the city that you no longer feel part of it. Many people know the roof terraces of the Cathedral but the terraces of Santa Eulàlia are still kind of an insider tip. While you walk under the flying buttresses and along the large colorful windows of the nave, the grim…