National Geographic Travelのインスタグラム(natgeotravel) - 2月14日 17時36分

Photo by @shonephoto (Robbie Shone) // With the iconic Matterhorn mountain looming large in the background, two explorers search the surface of the ice for moulins and caves that could lead them down to the contact, where the glacier meets the rock of the valley floor. It is during the middle of the night, when it is the coldest and there is no running meltwater, that it is the safest time to explore these caves.

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