Each June there is an event in the Smokies that does not occur many places in the world.
As you are planning your trips for the summer you might want to consider this. I have included a few links that describes the phenomena much better than I can.
http://www.smokymountainnews.com/issues/05_03/05_28_03/out_naturalist.html
http://en.wikipedia.org/wiki/Firefly
http://www.nps.gov/grsm/naturescience/fireflies.htm
As you are planning your trips for the summer you might want to consider this. I have included a few links that describes the phenomena much better than I can.
http://www.smokymountainnews.com/issues/05_03/05_28_03/out_naturalist.html
http://en.wikipedia.org/wiki/Firefly
http://www.nps.gov/grsm/naturescience/fireflies.htm