Added on May 18, 2012
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ZombieGirl June 23, 2012
largest underground lake in the U.S — and second-biggest in the world http://www.flickr.com/photos/nicksee/2854682983/ http://www.flickr.com/photos/just2peachy/4002755613/ http://www.flickr.com/photos/bslatas/5857214544/
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