Las Vegas Sun

October 1, 2016

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Patti Heil visits caves covered in ice along Lake Superior near Cornucopia, Minn. A deep freeze this winter has made it so people can walk across the frozen lake and look at the natural ice formations, but it has also hindered shipping in the region.

John M. Glionna / Los Angeles Times

Patti Heil visits caves covered in ice along Lake Superior near Cornucopia, Minn. A deep freeze this winter has made it so people can walk across the frozen lake and look at the natural ice formations, but it has also hindered shipping in the region.