About 176,000 years ago, Neanderthals built enormous rings from broken stone formations 336 meters inside a French cave — more than two tonnes of material arranged in total darkness for a purpose archaeologists still cannot explain

About 176,000 years ago, Neanderthals built enormous rings from broken stone formations 336 meters inside a French cave — more than two tonnes of material arranged in total darkness for a purpose archaeologists still cannot explain

The discovery forces archaeologists to reconsider what Neanderthals were capable of—and what drove them into the deepest darkness.