Remembering History: Art historians are probing a real life Da Vinci Code style mystery after discovering tiny numbers and letters painted into the eyes of the artist's enigmatic Mona Lisa painting.

Art historians are probing a real life Da Vinci Code style mystery after discovering tiny numbers and letters painted into the eyes of the artist's enigmatic Mona Lisa painting.

Art historians are probing a real life Da Vinci Code style mystery after discovering tiny numbers and letters painted into the eyes of the artist's enigmatic Mona Lisa painting.