Neanderthals constructed complex subterranean buildings 175,000 years ago, a new archaeological discovery has found. Neanderthals built mysterious, fire-scorched rings of stalagmites 1,100 feet into a dark cave in southern France—a find that radically alters our understanding of Neanderthal culture.

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Neanderthals constructed complex subterranean buildings 175,000 years ago, a new archaeological discovery has found. Neanderthals built mysterious, fire-scorched rings of stalagmites 1,100 feet into a dark cave in southern France—a find that radically alters our understanding of Neanderthal culture.