Follow the ermine!

150 nails, adorned with an ermine, are scattered throughout the streets of the Corsair City. They represent a historical journey with 42 explanatory markers (the open data of which are available [here] (https://www.data.gouv.fr/en/datasets/cours-historique-saint-malo-intra-muros/)).
The route of this course can be downloaded below.

The ermine represents the coat of arms of the City of Saint-Malo, and recalls its belonging to the Duchy of Brittany.