Old Faithful erupts more frequently than any of the other big geysers, although it is not the largest or most regular geyser in the park. Its average interval between eruptions is about 76 minutes ...

NASA scientists concocted an idea a decade ago to save the world from a civilization-ending eruption of the supervolcano underneath Yellowstone ...

This story appears in the December 2016 issue of National Geographic magazine. Become a member of National Geographic to explore more incredible images and stories from our archives. The star of ...

Visit the National Park Service's Old Faithful Area page for more information. Full-Day Guided Yellowstone Day Tour (196 reviews) ...