Visitors take photos in an ice cave in Ningwu County, Shanxi Province, China. The cave - believed to be three million years old - is more than 100 metres long and the ice remains all year round.
Picture: Xinhua /Landov / Barcroft Media
Source: Daily Mail
Hang Son Doong Cave - world’s largest cave.
Subterranean river in cave with sunlight coming through hole in roof
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