Something didn't add up on the side of Chimborazo.

Alexander von Humboldt had spent three years crossing South America by 1802, cataloging plants no European had named, and in June he set out to climb the mountain his era believed was the tallest on earth. His guides turned back a few thousand feet up, warning him the mountain didn't want him there. He kept climbing anyway, past nineteen thousand feet, until a crevasse he couldn't cross stopped him for good.