Earliest 'Mona Lisa' copy hangs at Prado

An authenticated contemporary copy of da Vinci's Mona Lisa at the Prado Museum in Madrid on February 1, 2012.

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    Earliest 'Mona Lisa' copy hangs at Prado

The earliest known copy of da Vinci's 'Mona Lisa,' possibly painted by a student, is on display at the Prado in Madrid.