The charcoal portrait, in which the woman is holding a similar pose to the Mona Lisa (above) but with her body more side-on and her head turned further over her left shoulder, has been held in a collection  north of Paris since 1862. Photograph: iStock

A French art expert believes a charcoal drawing kept in a collection for more than 150 years may be a preparatory sketch made by Leonardo da Vinci of (...)

Silvano Vinceti (top), head of Italy’s National Committee for the Promotion of Historic and Cultural Heritage, looks on as researchers open the tomb in the stone church floor above the family crypt of Florentine silk merchant Francesco del Giocondo at the Santissima Annunziata basilica in Florence. Photograph:  Stefano Rellandini/Reuters

Researchers opened a centuries-old Florence tomb in a search for remains that could confirm the identity of the woman whose enigmatic smile Leonardo d(...)