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In this episode of The Atlas Obscura Podcast, we venture into the deep woods of Pennsylvania, home to the Pennsylvania Firefly Festival, and a phenomena that has drawn attention from scientists and people around the world—and was recently almost destroyed.

Our podcast is an audio guide to the world’s wondrous, awe-inspiring, strange places. In under 15 minutes, we’ll take you to an incredible site, and along the way you’ll meet some fascinating people and hear their stories. Join us daily, Monday through Thursday, to explore a new wonder with cofounder Dylan Thuras and a neighborhood of Atlas Obscura reporters.

Radim Schreiber/FireflyExperience.org/Wikimedia