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Visitors congregate at a favorite overlook, Mammoth Hot Springs Terraces, Yellowstone National Park.  Visitors follow boardwalks to view hot springs terraces at Mammoth Hot Springs.  Yellowstone National Park, the first National Park in the world, still enthrals over three million visitors a year with it's geothermal features,wildlife,  rugged mountains, deep canyons and stunning ecosystem.
110723_Wyoming_5781 Mammoth Hot Springs, Yellowstone National Park.jpg