Prado Museum in Madrid , Spain , reveals discovery of earliest known copy of ' Mona Lisa ' Image is thought to have been painted around the same time as Leonardo da Vinci 's original painting . Conservators found the portrait hidden beneath layers of black overpainting during restoration work on a picture initially thought to have been a later replica of the `` Mona Lisa . '' It will be unveiled later this month , before joining temporary exhibition at the Louvre , Paris .
Prado Museum in Madrid , Spain , reveals discovery of earliest known copy of ' Mona Lisa ' Image is thought to have been painted around the same time as Leonardo da Vinci 's original painting . It will be unveiled later this month , before joining temporary exhibition at the Louvre , Paris .