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Errr, well, a tunnel, cave or ice cave... ?
River in ravine?
I have a strong suspicion that this is in connection with a glacier- a view in an ice cave with stairs (glacier cave)- a cable car or alpine railway nearby somewhere in the alps, probably not too far away from our Ragged Robin (Valais). Probably totally wrong, but lets's have a go anyway....
It seems there's a puzzle within a puzzle then... why blast through a mountain to make a dead-end road...