A young Frenchman died on a battlefield one hundred years ago in World War I. Countless others too. His grieving family kept his bedroom just as it was when he left, as so many families do. But this family wrote into the deed of the house that all future owners must keep the young man’s room just as it is for 500 years. Five hundred years! The soldier’s dress uniform is falling apart from age, and maybe moths. Photographs and possessions are neatly laid out–a private museum to his memory. But no one remembers him. His family is long gone,…