Sightseers trek across a frozen expanse of Lake Superior, the world's largest freshwater lake, to the sea caves of the Apostle Islands National Lakeshore near Cornucopia, Wisconsin Saturday. According to the National Oceanic and Atmospheric Administration (NOAA) Great Lakes Environmental Research Laboratory, about 94% of Lake Superior is covered with ice, enabling thousands of people to visit the islands on foot for the first time since 2009. REUTERS/Eric Miller
Winter builds rare icy path to Lake Superior ice caves
Crowds of people are flocking to northwestern Wisconsin to trek on a frozen-over Lake Superior to reach dramatic ice caves accessible on foot for the first time in several years, courtesy of the long frigid winter.<
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