From snowy summits in Switzerland to grassy peaks in Ireland, these mountains offer hikers the opportunity to test their limits—and catch breathtaking views. https://on.natgeo.com/2XHcQVz

From snowy summits in Switzerland to grassy peaks in Ireland, these mountains offer hikers the opportunity to test their limits—and catch breathtaking views. https://on.natgeo.com/2XHcQVz 

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