La durmiente de Nápoles

You cannot go and see this painting. Ingres finished his sleeping nude in Rome in 1809, and Joachim Murat, the cavalry general Napoleon had made king of Naples, bought it and hung it in the palace. Murat's wife Caroline liked it enough to order a companion piece of the same size a few years later, and that companion, the Grande Odalisque, is now one of the most famous nudes in the Louvre. The sleeper herself vanished. In 1815 Napoleon's empire collapsed, Murat lost his throne and then his life, and the palace in Naples was looted. The painting was never seen again. What survives are Ingres's preparatory studies and a single old photograph of one of them.