it is widely known as the Mona Lisa Hekking after ex-owner Raymond Hekking. Hekking, who died in 1977, cast doubt on the authenticity of the original masterpiece now at the Louvre museum.

Leonardo da Vinci's masterpiece ' Mona Lisa,' on display at the Louvre Museum in France ... he discovered that only nail marks remained in the original place where it was displayed.

Visiting the Louvre museum for the first time is a time-honored right of passage for any trip to Paris, France. And seeing the Mona Lisa tops the bucket list of many travel and art lovers.

In 1910, Vincenzo begins working at glassworks company Gobier, which was busy fitting glass covers on 16,000 paintings at the Louvre to protect them from vandalism. A worker hanging the Mona Lisa ...

Instead Professor Kemp says Leonardo probably never handed the portrait over to his original client ... shows that it [the Louvre Mona Lisa] underwent an evolution, as all Leonardo's pictures ...

Nearly 8.5 million people visit her every year. Yet few have ever heard about the time the Mona Lisa actually vanished from the Louvre in Paris for nearly two and a half years.