Louisville Mega Cavern: Zip Line Underground 2016533728762299155-blid-7644065917870373369

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Zip lining has gained in popularity over the past several years, but did you know you can zip line beneath the earth's surface? Louisville, Kentucky, offers the world's only underground zip line tour.
from: http://ezinearticles.com/?Louisville-Mega-Cavern:-Zip-Line-Underground&id=7804356