It's not exactly new to say that Barcelona has amazing architecture (hello, Gaudi!). It's a very walkable city, so you can go from the Modernist-bestrewned octagonal blocks of Eixample to medieval mazes to Port Vell long before your brain has time to create any kind of context.
Two favorite photos: some of the plethora of gargoyles, all of which look as seriously irritated as a gargoyle should, and boats in the port.
