The Maginot Line trail

As this trail crosses the Strasbourg – Roeschwoog – Lauterbourg – Karlsruhe (D), Strasbourg – Haguenau – Wissembourg – Winden (D) – Neustadt/W. (D) and Strasbourg – Niederbronn-les-Bains – Bitche railway lines, it can be done stage by stage and you can easily return to your starting point.