Why is the Mona Lisa so Famous

The Mona Lisa is widely considered the greatest portrait of all time. It appears in countless advertisements, has inspired poetry, sculpture, forgeries, and theft. But seriously, why? The painting is small, only 30 x 21 inches, the color is somber, the background seems desolate and eerie, and the subject isn't anyone historically significant. So, what is all the brouhaha about? Is it really all about her mystifying gaze and a quirkly smile? Well, let's take a closer look.