Visitors look at the tomb of Leonardo da Vinci at Saint-Hubert church of the Chateau d'Amboise in Amboise, France, May 1, 2019. Thursday marks the 500th anniversary of the death of Renaissance master Leonardo da Vinci. The famed painter, sculptor, writer, inventor, scientist and mathematician spent his last three years in Amboise as a guest of France's King Francis I. (Xinhua/Gao Jing)