Las Vegas Sun - Photograph : Frozen Great Lakes

October 19, 2017

Currently: 75° — Complete forecast

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.