The SEAT factory in Martorell Historical milestone · Martorell, Baix Llobregat, Barcelona Image of Martorell, not of the place itself. The opening of the car plant in 1993 made Martorell the largest industrial centre of the Baix Llobregat and replaced the Barcelona factory of the Zona Franca. Together with Solvay and Cargill it sets the manufacturing profile of the municipality. 1993 Photo: Pasarell10 (CC BY-SA 4.0) What to see and do in Martorell