In this Feb. 2, 2014 photo people visit the caves at  Apostle Islands National Lakeshore in northern Wisconsin, transformed into a dazzling display of ice sculptures by the arctic siege gripping the Upper Midwest. The caves are usually are accessible only by water, but Lake Superior's rock-solid ice cover is letting people walk to them for the first time since 2009.  (AP Photo/The Minneapolis Star Tribune, Brian Peterson) MANDATORY CREDIT; ST. PAUL PIONEER PRESS OUT; MAGS OUT; TWIN CITIES TV OUT ORG XMIT: MNMIT201 Photo: Brian Peterson, AP / Minneapolis Star Tribune
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