Synchronous fireflies fill the forest at the Elkmont campground in the Great Smoky Mountains National Park in Gatlinburg, Tennessee Thursday, June 7, 2018, where 984 people from places as far as Alaska descended to experience the synchronized flash patterns which peak during a two-week period in late May to mid-June. 1,800 parking permits were granted to some of the 22,000 people who entered the lottery. An estimated 800-1,000 people are expected at the campground each night.
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