Ruinaulta is the dramatic gorge the Rhine has carved through the ancient Flims rockslide debris south of the village. Tall white limestone pinnacles rise from the canyon floor, the river churns turquoise below, and the forested slopes above are largely roadless and silent. It is one of the most spectacular landscapes in Switzerland and still surprisingly little visited.
The best access is by train: the Rhaetian Railway runs through the gorge on its route between Reichenau-Tamins and Ilanz, with several small stations. You can walk the full length of the gorge floor (about 13 km), taking the train one way. The viewing platform at Il Spir, reachable from Flims by a short walk, gives the most dramatic overview of the gorge from above.