Mona Lisa 'twin' goes on display

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

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    Mona Lisa 'twin' goes on display

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A copy of the Mona Lisa, painted by one of Leonardo da Vinci's pupils, goes on display at Madrid's Prado Museum.