Midway through “Treasures From the House of Alba: 500 Years of Art and Collecting,” you encounter Francisco de Goya’s mysterious full-length, life-size masterpiece “The Duchess of Alba in White” (1795). The official portrait of the duchess, she’s also the unofficial centerpiece of this stunning exhibition of more than 140 artworks. It’s like your hostess coming late to the party. You don’t mind because you’re already giddy—drunk on art—and she’s absolutely ravishing.
