The Spectacular Ice Caves of Lake Superior
For the first time in five years, visitors can walk, ski, or snowshoe more than a mile on frozen Lake Superior to check out ice caves formed by crashing waves at the Apostle Islands National Lakeshore in Wisconsin
Eric Miller / Reuters
Mike Rundle, from Janesville, Wisconsin, looks at ice formations in a sea cave at the Apostle Islands National Lakeshore of Lake Superior near Cornucopia, Wisconsin Feb. 15, 2014.
