One of the most famous art heists in history was the 1911 theft of the "Mona Lisa." The 16th-century Leonardo da Vinci masterpiece was stolen by Vincenzo Peruggia, an Italian immigrant who'd worked at the Louvre as a handyman and who smuggled the painting out of the building after hours by removing it from its frame and hiding it beneath his work coat.

speculation is growing around where the lavish, stolen jewels that once adorned France's royals might end up.