Antarctica

We’ve come to one of the coldest spots on Earth to search for beings that thrive in blistering heat. In a place with full daylight for four months, we’re seeking life that dwells in utter darkness. Welcome to the topsy-turvy world of Antarctica’s Mt. Erebus. Above: A mix of ropes and ladders eases access to Warren Cave, a labyrinth of passages melted from the ice by the volcano’s heat. Small currents of air probably cause the scalloping around the cave’s entrance. Image © Carsten Peter / National Geographic

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