Though the American expatriate John Singer Sargent is best known for his society portraits—among them the unforgettable Portrait of Madame X (Madame Pierre Gautreau)—he also left an entire visual portfolio of his time in Spain. During seven lengthy visits between 1879 and 1912, Sargent created more than 225 oils, watercolors, drawings, and sketches. His subjects? Dramatic landscapes. Flamenco dancers. Detailed architectural portraits. This is going to be a big show. —C.M.