Thousands of people are making the journey to northern Wisconsin to visit the sea caves at the Apostle Islands National Lakeshore. The frozen icicles form from cracks in the sandstone formations.
"There are seeps above the rocks and and there are crevices in the rocks so there's a lot of water that seeps out and down that's freezing on top of the rocks," says Bob Krumenaker, the Parks Superintendent at Apostle Islands National Lakeshore. "That's creating the cave-like formations as if you were in an underground limestone cavern."
The formations sit more than a mile out from the start of the trail. Krumenaker recommends visiting on a week day when it is less busy so you can park closer and cut your walking distance down. If you want to visit, it is important to wear a lot of layers. Make sure you have thick socks on and heavy boots. It is also recommended to wear ice cleats if you have them. Bring along a walking stick or a ski pole. Before heading to the caves, check the Apostle Islands National Lakeshore website, which you can find at the bottom of this article, to check ice and wind conditions. Make sure you have water with you and don't forget to bring your camera.
"This is for many people, probably a once in a life time experience," says Krumenaker. "These ice caves are unique and while there may be somewhere else in the world you can experience this, i don't know where it is. It's a very rare phenomenon; it's incredibly beautiful. It's a way to see nature in the winter doing what nature is supposed to do."
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