As of April 2014, The Mona Lisa by Leonardo da Vinci is housed in the Louvre Museum in Paris. It is the property of the French Republic and has been a part of the Louvre's collection since 1797.
Leonardo da Vinci brought the Mona Lisa to France in 1516, and it was bought by King Francis I. It was displayed at Versailles for a while, and Napoleon had it hanging in his bedroom at the Tuileries Palace. Finally, it ended up at the Louvre. It was stolen in 1911 by a worker at the Louvre named Vincenzo Peruggia, who smuggled the unframed painting out under his smock. Peruggia hid the Mona Lisa in his apartment for two years. When he tried to sell it to a gallery in Florence in 1913, he was caught, and the painting was returned to France.