One day after the Apostle Islands ice caves opened to the public for the first time since 2015, the caves are again closed.

The ice caves in northern Wisconsin reopened Monday but closed Tuesday.

In a cave in Romania, scientists found a bacterial strain entombed in ice that is resistant to 10 modern antibiotics. But it may also help fight superbugs.

APOSTLE ISLANDS NATIONAL LAKESHORE — My calves ached as I walked on frozen Lake Superior, carefully maneuvering around jagged ...

The Apostle Islands ice caves opened at 8:30 a.m. Monday, Feb. 16. They hadn't been open to the public since 2015.

The Apostle Islands ice caves are officially closed after the winter storm this week broke up the ice shelf. It's unlikely ...

Where thousands of people had trekked across ice to the caves on Monday, remote cameras operated by the University of Wisconsin-Madison now show open water. A winter storm that blew in Tuesday, ...

The caves opened to the public this week for the first time since 2015.

Rare sub-zero conditions briefly made the Lake Superior formations accessible before a winter storm closed them again.

The closure was announced late Monday after a busy day of hikers trekking across the lake to view this wonder, which hasn’t been safe enough for visitors in more than a decade.

MT. RAINIER NATIONAL PARK, Wash. - A hike into ice caves near Mt. Rainier turned into an incredible experience like no other when the ice became awash in brilliant colors. "I could not believe my eyes ...