"La Maquinista" is a large mall on the outskirts of Barcelona. It has a few larger stores rather than the boutique like stores found many other places. To get there take the Metro L1 Line (red) to the Sant Andreu exit. Walk towards the church across the street (to the right when you exit the station) and pass the Renfe train station. It´s about a 10-15 minute walk.
La Maquinista
Large open-air shopping mall in Sant Andreu district