The only existing self-portrait of Leonardo da Vinci will be on show for two-and-a-half months as part of the ‘Leonardo and the treasures of the king’ exhibition at the Royal Library in Turin’s Palazzo Reale. The fragile chalk sketch has only been put on display three times in the past century, and numbers visiting the new exhibition will be limited to 25 per hour, with advance booking required. Read more: thelocal.it