The first museum dedicated exclusively to Catalan Modernisme is set on two floors of a Modernist former textile factory designed by Enric Sagnier and built from 1902 to 1904. The ground level is dominated by a mix of graphic art—wonderful posters, in many cases—and furniture designed by Antoni Gaudí, Joan Busquets, and Gaspar Homar. The Gaudí displays include some seminal pieces from his collaborations with Josep Maria Jujol. (They worked together on most of the furniture for Casa Batlló, and Jujol assisted with the ornamentation of Casa Mila.) You can’t touch the works, let alone sit in the chairs, but nowhere else can you get so close to pieces and study their design lines and construction techniques. The basement exhibitions include a lot of Modernisme painting and sculpture, including the impassioned marbles of Eusebi Arnau, who did some of the major sculpture for the Palau de la Música Catalana.