Fairy-tale villages. Alpine lakes as blue as cobalt. Regal ibex standing sentry on misty ridges — the Engadin Valley, a narrow ravine cutting across the Swiss canton of Graubünden, is one the most sublime pockets of the Alps. Long a coveted destination for skiers, hikers, and outdoor adventurers, the valley has culinary verve and cultural cachet worthy of its scenic splendor. From the glitzy, celebrity-studded ski resorts of St. Moritz — the St. Tropez of the Alps — to sleepy mountain hamlets frozen in time since the medieval era, the Engadin mesmerizes.