Mona Lisa
The painting is thought to be a portrait of Lisa Gherardini, the wife of Francesco del Giocondo, and is in oil on a white Lombardy poplar panel. It had been believed to have been painted between 1503 and 1506; however, Leonardo may have continued working on it as late as 1517. Recent academic work suggests that it would not have been started before 1513. It was acquired by King Francis I of France and is now the property of the French Republic, on permanent display at the Louvre Museum in Paris since 1797.
The Smile (book)
The "Mona Lisa" 
"The Smile" refers to the woman depicted in Leonardo da Vinci's painting. Several questions surround the mysterious painting, focusing most pointedly at the debate over who the true muse was or whether she was merely an invention of da Vinci's imagination. Napoli took the most proposed muse, Lisa Gherardini and her known husband, Francesco del Giocondo, and created a story for them based on life in Florence in the late 15th Century to early 16th Century. Although it is unknown who the sitter truly was, it is known for fact that the painting was created in Florence, Italy between the years 1503-1506.