A unique piece of industrial modernist architecture, Caixa Forum is old Catalan textile factory built in the early 20th century and designed by the architect Puig i Cadafalch. Now, it’s a cultural space which is definitely worth checking out, either to take a look at the programs they offer or simply to gaze at the building’s renovation from the outside, completed by international architects such as Arata Isozaki with his twin trees in steel and glass. During the day, visit the dazzling limestone patio, in reference to the Barcelona Pavilion designed by Mies van der Rohe. Caixa Forum is kids-friendly, with sections exclusively for children. It also has its own book shop specialising in art, architecture, design and photography – great for gifts (or for treating yourself!).