Yellowstone National Park

The Abyss geothermal pool is seen October 8, 2012 in Yellowstone National Park in Wyoming. Yellowstone protects about 10,000 geysers, mudpots, steamvents, and hot springs and is America's first national park. It extends through Wyoming, Montana, and Idaho. (Karen Bleier/AFP/Getty Images)

The Abyss geothermal pool is seen October 8, 2012 in Yellowstone National Park in Wyoming. Yellowstone protects about 10,000 geysers, mudpots, steamvents, and hot springs and is America’s first national park. It extends through Wyoming, Montana, and Idaho. (Karen Bleier/AFP/Getty Images)