<P> Given the issue surrounding the dating of the painting, the presence of the flanking columns in the Raphael sketch, the uncertainty concerning the person who commissioned it and its fate around the time of Leonardo's death, a number of experts have argued that Leonardo painted two versions of the Mona Lisa . The first would have been commissioned by Francesco del Giocondo circa 1503, had flanking columns, have been left unfinished and have been in Salai's possession in 1525 . The second, commissioned by Giuliano de Medici circa 1513, without the flanking columns, would have been sold by Salai to Francis I in 1518 and be the one in the Louvre today . </P> <P> The painting was kept at the Palace of Fontainebleau, where it remained until Louis XIV moved the painting to the Palace of Versailles . After the French Revolution, it was moved to the Louvre, but spent a brief period in the bedroom of Napoleon in the Tuileries Palace . </P> <P> During the Franco - Prussian War (1870--71) it was moved from the Louvre to the Brest Arsenal . During World War II, the painting was again removed from the Louvre and taken safely, first to Château d'Amboise, then to the Loc - Dieu Abbey and Château de Chambord, then finally to the Ingres Museum in Montauban . </P> <P> In December 2015, it was reported that French scientist Pascal Cotte had found a hidden portrait underneath the surface of the painting using reflective light technology . The portrait is an underlying image of a model looking off to the side . Having been given access to the painting by Louvre in 2004, Cotte spent ten years using layer amplification methods to study the painting . According to Cotte, the underlying image is Leonardo's original Mona Lisa . </P>

Where was the mona lisa kept during ww2