Hidden portrait 'found under Mona Lisa': French scientist

French scientist Cotte says he has found an image of a portrait underneath the existing Mona Lisa painting using reflective light technology

Mona Lisa': Hidden portraits 'found underneath

Mona Lisa copy to go under the hammer in Paris auction

Mona Lisa': Hidden portraits 'found underneath

Behind Mona Lisa's smile: another woman?

Markus A. Frey, president of The Mona Lisa Foundation, points at a painting attributed to Leonardo da Vinci representing Mona Lisa, displayed during a presentation at a secret location, in Switzerland, Thursday

Mona Lisa second portrait spotted under Leonardo da Vinci's masterpiece

Hidden portrait 'found under Mona Lisa', claims French scientist

Leonardo da Vinci's brilliance endures 500 years after his death

Hidden Drawing Discovered Beneath 'Mona Lisa

Mona Lisa': Hidden portraits 'found underneath

Mona Lisa second portrait spotted under Leonardo da Vinci's masterpiece

Mona Lisa': scientists unlock secret of da Vinci techniques