What's so special about Mona Lisa ?

It is the most famous painting in the world. Visitors from around the world throng to the Louvre in the hope that they will be able to admire the painting. Viewers are intrigued and fascinated by it, but why ? Is it the faint smile ? How can the painting's secrets be deciphered ? An indispensable companion for individuals or families who wish to discover this Renaissance masterpiece by the great Vinci, and finally gain an understanding of what is so special about the Mona Lisa.