The shopping centre called La Maquinista is an open-air mall, the only one of this kind in Barcelona and the biggest in Catalonia. There are more than 200 stores in this spread out complex, if you plan to go for shopping you will find concentrated a lot of shops as well as restaurants and entertainment such as a cinema.
At the Maquinista you can find brands such as Alain Afflelou, Blue Spirit, Coronel Tapioca, Decimas, Foot Locker, Douglas, ideas, Intersport, Naturcenter, Sephora, Yves Rocher, Swarovsky...
What you need to take into account is that La Maquinista is not a centric shopping centre, to get there the easiest is to get the metro L1 in Sant Andreu or Torras i Bages. You can also get there by taking the L9 Orange line (La Sagrera - Can Zam) or the L10 Light blue line (La Sagrera - Gorg).
If you want to arrive by bus you have different lines available that will get you there: Line 11,Line 40,Line 42,Line 60,Line 73, Line B19, Line B20, Line N8, Line N9,Line H8. You can check your route in TMB.
If you have your own vehicle, there is an outdoor car park and an indoor one, both of them are free of charge. The exit by the Ronda de Dalt is the number 1 Maquinista sector and if you come through Ronda Litoral the exit is the number 30.