Photo of the Day

December 26, 2019

Night Lights

Fireflies flash and streak through a summer night in the Great Smoky Mountains National Park. The aim of the spectacular light show is to seduce prospective mates.

Photograph by DAVID LIITTSCHWAGER, Nat Geo Image Collection

Go Further

Subscriber Exclusive Content

See how NASA’s new Mars rover will explore the red planet

Why are people so dang obsessed with Mars?

How viruses shape our world

The era of greyhound racing in the U.S. is coming to an end

See how people have imagined life on Mars through history