The Last Supper was painted on an inside wall of Santa Maria delle Grazie right at the end of the 15th century. Leonardo da Vinci had no idea that his work would go on to be known as one of the greatest paintings ever made.
The mysterious painting, depicting Jesus eating a final meal with his disciples, has long fascinated art lovers and historians. Despite various restoration attempts, it remains extremely fragile, with temperature control hugely important in preventing further damage from humidity.