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The Glacier Express. 7.5 hrs from Zermatt to the Matterhorn/St Moritz.
This seven-hour trek connecting the Swiss mountain resorts of St. Moritz and Zermatt carries you along the Rhine river through 91 tunnels, across 291 bridges and over the Oberalp pass at its highest altitude of 6670 feet. The journey's signature structure, the Landwasser viaduct (pictured), is one of the most photographed bridges in Europe due to its enormous yet delicate beauty.