The man responsible for some of the most striking architecture in Barcelona was Antoni Gaudí - and in a city with a reputation for experimental design, his buildings really do stand out.
One of Barcelona's landmarks of course is the famously unfinished cathedral La Sagrada Familia (below). Gaudí worked on it for years before his death and even though work is ongoing it is still some years from completion.
Sagrada Familia is not the only design of his remaining though. Take a walk up Passeig de Gràcia from Plaça Catalunya and you'll find the magnificent Casa Batlló, suposedly in the shape of St George and the dragon (St George - Sant Jordi - is the patron saint of Catalunya too) and slightly further up in Casa Millà, often known as La Pedrera.
And you can walk down the Ramblas to Plaça Reial and see streetlights designed by Gaudí too.
One design that is often overlooked though is Parc Güell. Although unfinished, the park is full of Gaudí's fantastic designs, including a house inspired by the story of Hansel and Gretel.