The home of the industrialist chocolatier Antoni Amatller is one of the greatest examples of the Catalan modernist architecture and one of the few that still have the ornamental richness of this style promoted by the bourgeoisie. Located on Passeig de Gràcia in Barcelona, it is the work of the architect Josep Puig i Cadafalch who was commissioned to remodel the building, acquired by the industrialist, from head to foot.

The Casa Amatller stands out for the composition of the façade and for the restructuring and redecoration of the ground floor and the main floor, a reflection of the originality of the modernista architecture and decorative arts. The façade is a colourful composition that incorporates sgraffito on a white base, ochre and red ochre, glazed tiles, green woodwork, black wrought iron and grey stone from Montjuïc. In addition, there is unique sculptural decoration, notable for the relief of St. George and the Dragon, designed by Eusebi Arnau. The tiered gable at the top of the façade is reminiscent of the classic shape of a tablet of chocolate and is one of the most characteristic features of the building. Inside, one must admire the antique furniture, the columns, the floor, the ceilings and the lamps, original decoration of the residence.

Currently, the Casa Amatller is home to the Amatller Institute of Hispanic Art. It has about 400 objects of Roman, Medieval, Baroque and Modernista periods. But above all it is noted for its documentary resources. It maintains a large photo library specialising in Hispanic art, with about 350,000 items illustrating and cataloguing the works of art. Its consultation is essential for any researcher in the history of the art.