On a budget, Barcelona Cathedral (La Seu) still earns its price.
€ (~€11 cultural visit)
Lead with the quirks, because the Gothic shell is one of many in the old town. The serene cloister keeps thirteen white geese — said to mark Saint Eulàlia's age at her martyrdom — honking among palms and a fountain, a genuinely odd, only-here detail. And there's the mistaken-identity trap: a steady stream of visitors arrives expecting Gaudí, realises this is the 13th–15th-century La Seu (its showy main facade actually a neo-Gothic skin finished in 1913), and leaves faintly let down. Worth it for the geese, the rooftop lift and the cloister calm; underwhelming if you wanted the Sagrada and wandered in here by mistake.