He was trapped inside the Louvre , with the world 's most famous painting tucked under his arm ... December 14 , 2013 marks $ 14.2 million the first anniversary of when Mona Lisa was returned after being stolen . It was snatched by an Italian handyman who worked inside the Mona Lisa . He had mistakenly thought that Napoleon had looted it and wanted to repatriate it . Confusion remains where Mona Lisa was kept during World War II .
December 14 , 2013 marks $ 14.2 million the first anniversary of when Mona Lisa was returned after being stolen . It was snatched by an Italian handyman who worked inside the Mona Lisa . He had mistakenly thought that Napoleon had looted it and wanted to repatriate it . Confusion remains where Mona Lisa was kept during World War II .