Make sure you take time to visit the Barcelona Cathedral in the Barri Gotic if you are visiting Barcelona. Built in the 13th century it sits right along the old Roman Wall and aqueduct. The cathedral costs 6 euros between 1 p.m. and 5 p.m. during the week. It's free before and after. It is really a beautiful cathedral and worth a visit. For me the ironwork really made me feel like I was in Spain.