National Geographic Travelのインスタグラム(natgeotravel) - 10月29日 17時09分

Photo by Robbie Shone @shonephoto | While thick fog swirls around outside on Mount Etna, an explorer admires a frozen lake in the misty subsurface of Grotta del Gelo. The lava tube formed following the cooling of a lava flow from an eruption that began in July 1614 and lasted for over 10 years. Grotta del Gelo is unusual, as finding lava tubes with ice inside is a rarity. #italy

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