The Mona Lisa Mystery

Hers is the most famous smile in the world, visited and studied by thousands every year, a priceless work of art —the one and only Mona Lisa. Or is it unique? With its striking similarities to the painting in the Louvre Museum, the so-called Isleworth Mona Lisa has remained an art world mystery since she was found in 1912. Did Leonardo da Vinci paint the legendary portrait twice?