This winter, 93% of Lake Superior froze, creating a spectacular icy landscape. Here, hundreds of small icicles are seen on the ceiling of a sandstone cave at the Apostle Islands National Lakeshore in northwest Wisconsin.
Bill Kirkos/CNN
The ice caves of Lake Superior —
Visitors from all over the world have visited Lakeshore to see the giant frozen waterfalls that have formed this winter.
Bill Kirkos/CNN
The ice caves of Lake Superior —
A "curtain" ice formation is seen on the side of a sandstone cliff at Lakeshore.
Bill Kirkos/CNN
The ice caves of Lake Superior —
White- and gold-colored icicles form out of a brown sandstone cave over the frozen waters of Lake Superior.
Bill Kirkos/CNN
The ice caves of Lake Superior —
In summer months, kayakers row into this cave where visitors have been able to walk this winter.
Bill Kirkos/CNN
The ice caves of Lake Superior —
Shown here is an "eyehole" ice formation.
Bill Kirkos/CNN
The ice caves of Lake Superior —
CNN correspondent Ted Rowlands, right, and Jake Carpenter walk almost four miles round-trip to the ice caves, pulling all of their equipment.
Bill Kirkos/CNN
The ice caves of Lake Superior —
Snow and ice dangle over Lake Superior, covering the edge of a cliff.
Bill Kirkos/CNN
The ice caves of Lake Superior —
Nina Kolar of St. Paul, Minnesota, crawls out of an ice cave. Kolar drove to the ice caves with two friends hoping to see the caves before warmer temperatures begin melting them.
Bill Kirkos/CNN
The ice caves of Lake Superior —
Stalactites ranging in size from a few inches to several feet dangle from a cave.
Bill Kirkos/CNN
The ice caves of Lake Superior —
Rowlands sits on frozen Lake Superior in an ice cave referred to by locals as "The Garage."
