Researchers are doing DNA testing to confirm the model for one of the most famous paintings in the world, the Mona Lisa. You can do some research of your own with these books and DVDs.
Math and the Mona Lisa: the art and science of Leonardo da Vinci
Becoming Mona Lisa: the making of a global icon
Vanished smile: the mysterious theft of Mona Lisa
Mona Lisa revealed: secrets of the painting [DVD]
The Louvre, where the painting is housed, provides some background on the mystery of the portrait, along with a multi-panel view of the painting.