USA: Big Four Ice Caves (interior) [1]

360° panorama by pix.
Click the image to open the interactive version.

A view inside Big Four Ice Caves along the Mountain Loop Highway near Silverton, Washington.  The glacier itself is located far below at the base of Big Four Mountain & the ceiling height is 30-40 feet up.  Falling snow & debris could be heard above, plus a constant threat of small avalanches.  Entering the cave is not recommended as a collapse or other dangers could occur at any moment.

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