This contemporary art museum occupies what used to be San Carlos Hospital. As well as the leading lights of international art, it also boasts a collection of 20C Spanish painting and sculpture and other art forms. The building's spectacular extension along Ronda de Atocha, completed in 2005, is by French architect Jean Nouvel; it hosts ambitious temporary exhibitions. In addition to Picasso's emblematic masterpiece, Guernica (1937), the museum also displays works by Gris, Miró, Dalí, Tapiès, Tanguy et al.