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The Prado Museum in Madrid, Spain, has revealed what is believed to be the earliest copy of Leonardo da Vinci's "Mona Lisa." AFP/Getty Images
The painting -- discovered during restoration work on this portrait -- is thought to have been painted by a pupil of Leonardo around the same time as the original. Museo del Prado, Madrid
The fully-restored piece -- a detail of which is shown here -- will be unveiled later this month in Madrid, before taking part in a temporary exhibition at the Louvre in Paris. Museo del Prado, Madrid
The Louvre is home to the original "Mona Lisa," also known as "La Gioconda," which was painted by Leonardo in the early 16th century. AFP/Getty Images
The "Mona Lisa," one of the world's most famous paintings, has inspired thousands of imitations, including this, the largest ever copy, painted in North Wales in 2009. AFP/Getty Images
