Mona Lisa
The painting is thought to be a portrait of Lisa Gherardini, the wife of Francesco del Giocondo, and is in oil on a white Lombardy poplar panel. It had been believed to have been painted between 1503 and 1506; however, Leonardo may have continued working on it as late as 1517. Recent academic work suggests that it would not have been started before 1513. It was acquired by King Francis I of France and is now the property of the French Republic, on permanent display at the Louvre Museum in Paris since 1797.
Mona Lisa (Prado's version)
The Prado "Mona Lisa" is a painting of the same subject as Leonardo da Vinci's famous "Mona Lisa" (which is held by the Louvre Museum, Paris). The painting has been displayed in the Museo del Prado in Madrid (Spain) since 1819, but was considered for decades a worthless copy. However, after its restoration in 2012, the Prado's "Mona Lisa" was claimed to be the earliest replica of Leonardo's masterpiece.