Nowhere else in Switzerland do the rules feel so firm. The Swiss National Park, founded in 1914 and the oldest in the Alps, is a place where the point is to leave things alone: no camping, no picking flowers, no dogs, no leaving the marked paths. For riders, that means a single public road runs through it, the Ofen Pass road between Zernez and the Val Müstair, and the whole experience happens at a steady speed behind a windscreen, with a few official car parks for the walkers who want more.
What you see from the saddle is still remarkable. The forest here is dominated by mountain pine and larch, dark, wiry and twisted at the edges, and it opens onto scree slopes where red deer graze at dusk and chamois pick their way along the rock. Ibex stand on the steeper ridges, marmots whistle from the grass, and golden eagles hang in the thermals. Bearded vultures, reintroduced to the Alps in this region, sometimes pass overhead with a wingspan that makes you check your mirrors twice. Early morning and evening are the best hours for animals.
The park's history is a story of Swiss caution. Local people had logged and hunted this land hard, and a small group of naturalists, backed by early conservationists, persuaded the authorities to lock a patch of valley away from human use. More than a century later it has become one of the most studied pieces of nature in Europe, a laboratory for watching what a landscape does when no one is managing it. The visitor centre in Zernez explains the story, and is worth a stop on a bad weather day.
Practical matters are straightforward. Zernez, with its sleepy centre and petrol station at the junction of the Engadin and the Ofen road, is the sensible place to tank up before you head in. Ride carefully: wildlife on the tarmac is routine, and the bends tighten as you climb. The road is generally open all year, but snow can close it briefly in winter, and the cold is real.
The air up here is clean, sharp and smelling of resin on warm days. If you want a single place to understand why the Alps are more than scenery, this is it, and you do not even need to step off your bike.