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所屬欄目：地理中國
所屬頻道：CCTV-10科教
年份：2015
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簡介：一句“大渡橋橫鐵索寒”的詩句讓大渡河上的瀘定橋聞名於世，然而，在瀘定橋身上卻存在諸多未解之謎。東側的橋基建在砂石堆積的軟基層上，當地鐵礦貧乏，古人放棄充足的石材木材，卻建起沉重的鐵索橋，隨著科考的深入，更多謎團一一開始浮現。收起
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