It"s nearly autumn in Chile, where signs of the season vary widely as one travels from the Atacama Desert in the north more than 2,600 miles south to the tip of Tierra del Fuego. Around halfway between these two extremes you can find Conguillío National Park and the volcano Llaima at Chile"s center. In March, at the start of the Southern Hemisphere"s autumn, the leaves of the deciduous forest begin to turn color and fall, and the native Chilean pine trees (Araucaria araucana) stand out even more strikingly.