I dive into the history surrounding the Mona Lisa heist. Believe it or not, the Mona Lisa was not always the world's most famous painting. In fact, it was overlooked for years until it was stolen. Over 6 MILLION people visit The Louvre to see the Mona Lisa each year. Why is she so popular? Is it that smile, those eyes, or the smokey painting technique Da Vinci used? So why is it valued at over $650 million US dollars now? To find the answer, you have to dig into the most famous art heist the world has ever seen.