Frozen in time: Dazzling pictures of Lake Superior caves show waterfalls iced over.
The geological marvels at the Apostle Islands National Lakeshore, Wisconsin, attract almost 150,000 visitors a year.
The geological marvels at the Apostle Islands National Lakeshore, Wisconsin, attract almost 150,000 visitors a year.
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See more pictures
http://www.dailymail.co.uk/news/article-2796874/ice-age-dazzling-pictures-lake-superior-waterfalls-frozen-place-needle-like-icicles-glistening-sun.html
More fascinating articles on caves on this blog
http://ottersandsciencenews.blogspot.ca/search/label/Geology%20-%20Caves
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