It 's a serendipitous spinoff from the five Great Lakes being virtually frozen over this winter , a rare event that marks the arctic misery afflicting the Midwest . The ice caves are spectacular this summer at Thousand Islands National Lakeshore . The freezing of the Great Lakes has created a natural wonder . More than 500 people walk three miles round - trip over a frozen Lake Superior . The caves are like ` ` walking into a hall of mirrors , '' visitor says .
The ice caves are spectacular this summer at Thousand Islands National Lakeshore . The freezing of the Great Lakes has created a natural wonder . More than 500 people walk three miles round - trip over a frozen Lake Superior . The caves are like ` ` walking into a hall of mirrors , '' visitor says .