A visitor is seen at a model-displaying hall of Leonardo da Vinci's inventions at Chateau du Clos Luce 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)