Yellowstone National Park claims the highest concentration of geysers of any place on Earth. Geysers are hot springs with plumbing challenges that result in eruptions. More than 300 can be found throughout the park, and none is more famous than Old Faithful. In fact, Old Faithful is the reason Yellowstone was designated a National Park -- the first in the United States -- in 1872.
Its name comes from the perceived regularity of its eruptions, which occur every 55 to 120 minutes and last for two to five minutes. The spectacular eruptions remain a source of fascination for the more than 3.5 million people who visit Yellowstone each year. The fact that the eruptions aren't quite as regular as they might seem -- and that the mean eruption interval seems to be lengthening -- keeps geologists fascinated, too.
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