Beautiful ice cave on Lake Superior

Thousands of ice columns with strange structures, sparkling down from the cliff at a national park of the United States surprised thousands of tourists.

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Columns of white "growing" ice from the cliffs on Lake Superior - the world's largest freshwater lake of the National Park in the Apostle Islands, Wisconsin, USA - attract nearly 150,000 visitors a year. : AP)

Visitors go outside an ice cave.(Photo: REX)

The structure with bizarre shapes flowing down from the cliff makes the viewer surprised and excited.(Photo: REX)

The scene inside a cave by Lake Superior.(Photo: AP)

Sparkling ice crystals hung above the ceiling. (Photo: REX)

Summer is the most ideal time for tourists who want to visit a cave by boat.In winter, ice ice picks up about 1,000 guests every day.(Photo: REX)

Despite the cold weather, thousands of people still explore ice cave and take souvenir photos.(Photo: AP)

Snow white outside the ice.(Photo: Flickr)

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