Lake Superior Freezes, Revealing Ice Caves Blocked for Years
Off the shore of Wisconsin, something is happening for the first time since 2009: the sea caves at the Apostle Islands are accessible and open to explorers. Sure, you can only get there by hiking 2 miles over a frozen Lake Superior, and that feels weird sometimes because the ice sort of moves. But when you get there it's like "fairyland of needle-like icicles," according to the National Park Service. Here are the best shots from Instagram shooters who visited them.