100 years before Frozen Planet aired on the BBC, photographer Herbert Ponting joined Captain Scott on the doomed British Antarctic Expedition.  He took this photograph, Grotto in an Iceberg, before the team set out for the interior without him. It magnificently captures the bleakness of the Antarctic landscape where extreme weather creates impossible structures like this grotto. Scott’s ship Terra Nova looks pitiful by comparison. Notice also the icicles reaching out for it, which seem to foreshadow the expedition’s tragic end.