6. Ponte Iya Kazurabashi, Japan

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Deep within the Iya Valley, the Kazurabashi Bridge is constructed from mountain vines, reflecting the historic customs of rural Japan. Crossing this structure becomes a voyage through time, as the groaning vines and shifting planks emphasize the bridge's delicate character. For additional safety, steel cables are woven with the vines every three years, yet the crossing remains an exciting and somewhat unsettling experience, particularly when you glimpse through the openings at the distant river below.