
Short trip or not, keep Mercat de Santa Caterina.
Allow 45 min–1 hr.
The thing to do here is eat, not just photograph the famous roof. Yes, Miralles and Tagliabue's rippling, 325,000-tile wave-roof is a design landmark best caught from the upper streets — but the real draw for a visitor is Cuines Santa Caterina, the excellent market restaurant inside, plus tapas counters where you sit among locals five minutes from the cathedral and a fraction as mobbed as La Boqueria. Below the roof are also exposed ruins of a medieval convent and Roman remains. The catch: it's smaller than La Boqueria, so if you're not eating, the visit really is just the roof and a quick loop.