A hot spring near the Mutnovksy volcano in Russia's Kamchatka peninsula cut a path through the ice of a glacier. The roof of the resulting cave is close to the surface of the glacier. In photos of it, you can see the sunlight penetrating the ice.
Link (Translation) -via Amusing Planet
(Photos:Denis Bud'ko and Sergey Krasnoshekov, respectively)
these are great pics, but its snow, not ice from a glacier... from your local fairbanks ice caver....
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