It's an incredible natural phenomenon that happens in just a few places in the world. For one week in the summer, synchronous fireflies put on a breathtaking show in Pennsylvania's Allegheny National Forest. WQED photojournalist Dave Forstate follows a group of still photographers setting up in the darkness to capture tens-of-thousands of lightning bugs as they flash in harmony.
A request from Saint Emma Monastery became sculpture Cliff Dupil's biggest challenge.
Tour this unique exhibition, "National Geographic: 50 Greatest Wildlife Photographs."