Switzerland, Canton Valais, Verbier, high plateau, Saas Valley, Saas-Fee, Fee Glacier, Metro Alpin, highest underground in the world with terminus at 3456 m

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Photo credit: © Udo Bernhart / Alamy / Afripics
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Keywords: 3456, alpin, alpine, canton, ch, deserted, fee, glacier, high, highest, metro, mountain, passage, plateau, saas, saas-fee, summit, switzerland, terminus, tunnel, underground, valais, valley, verbier, world