aerial panorama view of calanca valley and swiss alps on border of grisons and ticino, on the hiking trail from rifugio pian

activity aerial alpine alps autumn background beautiful buffalora calanca destination europe european fall forest grass graubuenden graubunden grisons hike hiking landscape mountain nature outdoor panorama panoramic path peak piz range rock scene scenery scenic sentiero sightseeing summit swiss switzerland termin terrain tessin ticino tourism trail travel trekking trip vacation valley view