ナショナルジオグラフィックのインスタグラム(natgeo) - 10月14日 15時40分

Photo by Robbie Shone @shonephoto / Zelske jama (cave) lies at the base of several natural rock bridges in Slovenia. Seen in the background, two explorers walk under one of the "skylights" where, long ago, the cave roof collapsed. This beautiful arched entrance portal has been formed over hundreds of thousands of years by constant erosion from the River Rak.

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