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Japan's mysterious 'Dragon Eye' lake

Tucked away on Mount Hachimantai in northeastern Japan is a lake called Kagami Numa. Most of the time it's pretty ordinary looking, but if you go there at the right time you might be lucky to get a glimpse of a phenomenon which transforms the lake into what looks like a giant eye. Local legend has it that it's caused by some lovelorn dragons in the area.

Video by Hiromi Tanoue