Tourists watch the Old Faithful geyser, which erupts, on average, every 90 minutes in the Yellowstone National Park.
Mark Ralston/AFP/Getty Images
July 17, 2011 Celebrating one of America's great national parks — and an upcoming vacation — in photos.
August 9, 2010 Federal agents caught the second of three escaped Arizona convicts near Yellowstone National Park.
July 30, 2010 A mother grizzly responsible for leading an attack on three campers near Yellowstone was euthanized.
July 29, 2010 A female grizzly bear suspected in attacks, one of them fatal, at campsites near Yellowstone, was captured along with 2 of 3 cubs. Besides the dead camper, two were injured. The bear will be killed.
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