The best things to do in Barcelona range from the ancient to the modern. The Barri Gòtic and its maze of narrow streets harken back to its Roman beginnings while the dramatic glass high-rises near the water scream contemporary architecture. And Gaudì? You cannot escape the city without visiting several of his iconic modernist buildings.
Most iconic sight: the almost-finished Sagrada Familia
Best Itinerary Theme: Visiting everything Gaudì
Best tapas: Ciutat Comtal
Wildest dining experience: El Nacional tapas
Most worthwhile day tour: Mount Serrat
Most disappointing: Not everything is within walking distance