Guangdong, 皇冠体育app
Visitors walk on a suspended glass corridor, about 100 meters above the ground, in a karst cave, formed about 100 million years ago, in Jiulong town, South 皇冠体育app's Guangdong province, Feb 26, 2015. The town is a popular choice for self-guided driving tour. [Photo/VCG]
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