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Lake Superior ice caves excite visitors

People visit the caves at Apostle Islands National Lakeshore in northern Wisconsin, transformed into a dazzling display of ice sculptures by the arctic siege gripping the upper Midwest.
People visit the caves at Apostle Islands National Lakeshore in northern Wisconsin, transformed into a dazzling display of ice sculptures by the arctic siege gripping the upper Midwest.
Brian Peterson, Minneapolis Star Tribune, Via AP
The caves are usually accessible only by water, but Lake Superior' s ice cover is letting people walk to them for the first time since 2009.
The caves are usually accessible only by water, but Lake Superior' s ice cover is letting people walk to them for the first time since 2009.
Brian Peterson, Minneapolis Star Tribune, Via AP
Icicles hang from the ceiling of a cave at Apostle Islands National Lakeshore in Wisconsin.
Icicles hang from the ceiling of a cave at Apostle Islands National Lakeshore in Wisconsin.
Brian Peterson, Minneapolis Star Tribune, Via AP
People take pictures inside a cave at Apostle Islands National Lakeshore in northern Wisconsin.
People take pictures inside a cave at Apostle Islands National Lakeshore in northern Wisconsin.
Brian Peterson, Minneapolis Star Tribune, Via AP
Caves formed over centuries along the Lake Superior shoreline by crashing waves, freezing and thawing.
Caves formed over centuries along the Lake Superior shoreline by crashing waves, freezing and thawing.
Brian Peterson, Minneapolis Star Tribune, Via AP
This year's temperatures have been so low that park officials say they’ve made the ice formations particularly striking.
This year's temperatures have been so low that park officials say they’ve made the ice formations particularly striking.
Brian Peterson, Minneapolis Star Tribune, Via AP
People take pictures of each other in a cave at Apostle Islands National Lakeshore in Wisconsin.
People take pictures of each other in a cave at Apostle Islands National Lakeshore in Wisconsin.
Brian Peterson, Minneapolis Star Tribune, Via AP
People visit the caves at Apostle Islands National Lakeshore in northern Wisconsin. Park officials say more than 35,000 people have hiked the more than 1-mile route across the ice in the Apostle Islands shore since Jan. 15.
People visit the caves at Apostle Islands National Lakeshore in northern Wisconsin. Park officials say more than 35,000 people have hiked the more than 1-mile route across the ice in the Apostle Islands shore since Jan. 15.
Brian Peterson, Minneapolis Star Tribune, Via AP
A round trip to the caves can take three hours or more.
A round trip to the caves can take three hours or more.
Brian Peterson, Minneapolis Star Tribune, Via AP
Woman takes a photo inside one of the Wisconsin caves.
Woman takes a photo inside one of the Wisconsin caves.
Brian Peterson, Minneapolis Star Tribune, Via AP
Travel on Lake Superior can be dangerous any time of the year, the National Park Service says on its website.
Travel on Lake Superior can be dangerous any time of the year, the National Park Service says on its website.
Brian Peterson, Minneapolis Star Tribune, Via AP
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