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Mammoth Cave park offers cool escape into an underground world Mammoth Cave National Park in Kentucky comprises 400 caves and is the longest known cave system in the world, offering subterranean adventure for tourists of all ages. Visitors can traverse the sometimes winding paths down into the cave's depths, enjoy the cool year-round 54- degree temperature at a leisurely stroll, or engage in various activities on the surface, such as boating or horseback riding. ShareThis news summary appeared in ASTA SmartBrief on 09/02/2011
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