Leonardo spent 4 years painting " The Mona Lisa" and it's worth 137 million Dollars It is the most famous painting! In fact it is the most famous painting in the world!
THEY HAD A THEORY THAT ON "THE MONA LISA" HER SMILE MEANT THAT SHE WAS SECRETLY PREGNANT!
A recent spate of books and articles have suggested that Leonardo was the leader of a clandestine society and that he hid secret codes and messages in his art work