Castellbell i el Vilar is kent for its cotton industry, awtho agricultur is at least as important tae the local economy. Castellbell castle (gothic, fowerteent hunderyear) wis ane o the twa main points (alang wi Claramunt castle) controllin access tae the lawer Llobregat valley, an hence tae Barcelona. The brig ower the Llobregat dates frae the fowerteent hunderyear an aw.