THE MONA LISA
The best known, most visited, most written about portrait in the world is a painting of a smiling woman by Leonardo da Vinci
It is an oil painting on a poplar wood panel. Most experts believe it is a picture of Lisa Gherardini, a woman who lived in Italy in the 1500s. Almost nothing else is known about her or her famous smile.
The Mona Lisa has been on permanent display in the Louvre Museum in Paris since 1797.
The directors of the Louvre have been covering up a secret for several years: Someone stole the Mona Lisa.
No one has any idea where the real painting is, or how thieves were able to break into the museum.
There were no clues other than a terrible, terrible smell.