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Just as people dress differently when temperatures plunge below zero, so does nature.
The caves at the Apostle Islands National Lakeshore in northern Wisconsin have been transformed into showplaces for dazzling natural ice sculptures.
The arctic siege gripping the Upper Midwest has turned most of the Great Lakes into vast frozen plains blanketed in white. At Apostle Islands National Lakeshore in northern Wisconsin, caves formed over centuries along the Lake Superior shoreline by crashing waves, freezing and thawing have been transformed into showplaces for dazzling natural ice sculptures.
The caves usually are accessible only by water, but Superior's rock-solid surface is letting people walk to them for the first time since 2009. About 35,000 have made the trek.
— Associated Press