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| A roiling mudpot just north of the Lake area. |
Those four features make up the vast array of geothermal features scattered throughout Yellowstone National Park. And the fire below the surface that is responsible for providing the fuel for these spectacular sights is a massive active caldera. A popular BBC special claims the caldera could erupt at any time, causing vast destruction and loss of life for hundreds of miles around the park. Geologists studying the caldera, however, believe a major eruption is many (hundreds or thousands) years away. Fear of meeting one's doom at Yellowstone does not seem to have frightened tourists from flocking to the geothermal areas, by far the most popular spots in the park.
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| The magnificent travertine terraces at Mammoth Hot Springs. |
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| The most famous geothermal feature in Yellowstone -- Old Faithful. |
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