A UNESCO-listed line that spirals from Chur over the 2,253-metre Bernina Pass and down to palm-fringed Tirano in Italy, passing the Morteratsch glacier and curving across the six-arched Landwasser viaduct. Panoramic carriages need a reservation, but here's the trick: regular regional trains run the identical route for the standard fare, with windows that actually open for photographs. Sit on the right heading south for the glacier.
Featured in Ten mountain railways with views you won't believe · Mountain