• 5 years ago
A mysterious and rare scene shows clouds flowing through a mountain passage in southern China's Tianmen National Park after rainfall.

In the video, shot in Zhangjiajie City in Hunan Province on April 20, the clouds can be seen flowing down into a 131.5-metre-high, 57-metre-wide and 60-metre-deep Tianmen Cave, which is a natural karst cave through mountains.

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