Arosa’s Tschuggen Bergoase is a Mario Botta–designed sanctuary carved into the mountain at Tschuggen Grand Hotel. Think glass light-sails, serene pools and saunas, expert treatments, and ski-to-spa ease (via the private Tschuggen Express). Ideal for car-free luxury itineraries.

Getting there:
Train to Chur, RhB to Arosa; hotel shuttle or local bus up to Tschuggen.