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Many have stared amazed as rock climbers wind their way up seemingly vertical cliffs in the Western mountains, but few take the plunge. But now, the advent of via ferratas -- "iron roads" -- has brought the holds, cracks, caribeeners and safety of rock climbing to a wider audience.

Rock climbing is a specialized sport, with its own equipment and techniques. But European-based via ferratas have begun to spring up in the U.S. mountain country to make the sport more accessible to more people.