陕西延安绝壁藏神秘古堡，整座大山几乎被掏空，数十间石屋相连，密密麻麻石窗震撼人心！｜Mysterious Castle Hidden on the Cliff in Yan'an, Shaanxi

阿乐的探索旅行

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https://youtu.be/nTQJ1IdHSks?si=gwQxSFntBYXitmgW