From 1503 to 1506, Italian artist Leonardo da Vinci created a painting that would become one of the most famous paintings in the world. The Mona Lisa had been hanging in the Louvre Museum in Paris, France for over 200 years--but in 1911 the famous painting seemed to mysteriously vanish. Who could have stolen the painting, and what was the motive behind this mysterious crime? Photographs and illustrations support the text.