Far from the place where you were born, you think of it without nostalgia, you see things, history, architecture, people, culture, with the right eye, like an easily moved stranger. This is how I see the frontier, the German border in Alsace-Lorraine (1871-1918) that determined my ancestors life: 4056 landmarks, running from Luxemburg to Swiss. About 280 kilometers long, a walk to make one day.