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15 U.S. cities for outdoor enthusiasts

By: Bryan Nelson on Oct. 18, 2010, 12:30 p.m.
Knoxville, Tennessee

Photo: Andrew Ciscel/Flickr

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Knoxville, Tenn.

Gateway to picturesque Appalachian towns and the Great Smoky Mountains National Park, Knoxville is also a great launching point for those who enjoy canoeing and fishing.

The lower elevations of the Great Smokies harbor some of the most diverse ecosystems in North America, and they are teeming with wildlife — everything from black bears to salamanders.