France, Italy presidents mark Leonardo's 500th death anniversary French president Emmanuel Macron and his Italian counterpart visit the sprawling chateau of Chambord -- which central double-helix staircase is attributed to Leonardo da Vinci -- as they mark the 500th anniversary of the Renaissance genius's death. Among the glitterati attending the event are Italian star architect Renzo Piano, French astronaut Thomas Pesquet and his Italian colleague Samantha Cristoforetti. IMAGES