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6. Ponte Iya Kazurabashi, Japan

In the remote Iya Valley, the Kazurabashi Bridge, crafted from mountain vines, reflects Japan's ancient roots. Crossing it feels like stepping back in time, with creaking vines and wobbly planks hinting at its fragility. Steel cables, added every three years for safety, don't erase the thrill—or slight unease—as you glimpse the river far below through gaps.