America’s Great Outdoors Tumblr updates

02/04/2014 10:02 AM EST

For the first time in five years, the ice on Lake Superior is thick enough to visit the spectacular sea caves of Apostle Islands National Lakeshore in Wisconsin. Inside the caves awaits a fairyland of needlelike icicles. The formations change from chamber to chamber and from day to day. Apostle Islands is experiencing high volume of visitors right now, so we recommend that you visit the caves during the week. Before heading to the caves, please call the Ice Line at (715) 779-3397 – extension 3, for the most current ice condition information.

Photo: National Park Service