National Geographic Travelのインスタグラム(natgeotravel) - 7月21日 08時52分

Photo @materas // Inside an ice cave beneath the Mendenhall Glacier, Juneau Icefield, Alaska. As the Mendenhall Glacier is retreating, it creates ice caves as the meltwater melts out underneath the ice. The Mendenhall has retreated 1.75 miles since 1929 and continues to retreat. The blue ice is hundreds of years old at the terminus of the galcier and absorbs all wavelengths of light except blue, giving the glacier it's incredible blue colors. Follow me @materas for more images like this from Alaska and around the world. #glacier #icecave #juneauicefield

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