With winter temperatures staying so low for so long, the Great Lakes are covered in generous volumes of ice. These sheets are thick enough that people can recreate (using caution) in various ways atop the lakes. The Apostle Islands sea caves on Lake Superior, a sight to see during warmer months, are a spectacle this winter as they are now glazed in ice. Check out a cool photo gallery by clicking this sentence.

Photo: Brian Peterson, Minneapolis Star Tribune