The adventure path
In order to give visitors an understanding of the special history of this former railway tunnel and its new inhabitants, the adventure path "Bat tunnel Huldange" was established in 2015. It is located on the Vennbahnradweg Aachen-Troisvierges on both sides of the former railway tunnel near the village of Huldange, accessible from the Luxembourg or Belgian side.
https://fledermaustunnel.naturpark-our.lu/fr/