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photograph by AER Wilmington DE
The receding Mendenhall Glacier in Alaska has been gradually melting away, revealing an ancient forest, as well as these gorgeous ice caves.
On the interior, water pools in alien-like grottoes and drips over the curved overhangs to create rippling effects like stained glass.
It’s just 12 miles from downtown Juneau, but adventurers must first take a kayak and then ice climb in order to experience the temporary wonder.