Warming prompts closure of Lake Superior ice caves

Nearly 2,000 hikers visited the sea caves Feb. 17.
Nearly 2,000 hikers visited the Apostle Island sea caves on Feb. 17 - and that was a slow day. An estimated 11,000 people converged on the ice caves on Saturday to see the frozen caves, the first time they've been accessible by foot in five years.
Dan Kraker / MPR News