It is a mystery which has divided experts for decades: Is the "Isleworth Mona Lisa" real? Yes, in case you didn’t know, there is a second version of Leonardo da Vinci’s Mona Lisa, which also depicts a similarly positioned woman - believed to be based on the Florentine noblewoman Lisa del Giocondo – and which looks younger (some say happier) than the one in the Louvre in Paris.

The so-called "Isleworth Mona Lisa" is considered by some as an earlier version of its famed cousin. It was brought to England in 1778 and acquired by the Montacute family. It got its name after being bought in 1913 by art dealer Hugh Blaker, who was based in Isleworth, west London.