The path taken by Simenon on his way to be an altar boy at the Bavière hospital chapel. The description of this route can be found in The Testimony of the Altar Boy, a short story that was part of the collection Maigret and the Surly Inspector.
We have no information on the difficulty of this circuit. You may encounter some surprises along the way. Before you go, please feel free to inquire more and take all necessary precautions. Have a good trip! 🌳🥾