This deep gorge used to be a difficult passage in the trade route over the Albrun pass to Italy. Today the old track with small natural rock tunnels and rare flowers offers a spectacular landscape experience.

Until the tunnel was built between Ausserbinn and Binn (1965), the remote valley was often cut off from the outside world for weeks at a time in winter.
Now the old footpath provides a spectacular scenic route for cyclists and walkers. With its tunnels and ancient walls supporting the sides and marking the edge, it is an impressive monument to earlier times.