From Old Faithful ... a long line get in the way of seeing a couple of Yellowstone's most inspiring hydrothermal features. Both the Grand Prismatic Spring and the now-dormant Excelsior Geyser ...

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 ...

U.S. News Insider Tip: Escape the crowds directly in front of Old Faithful and enjoy the geyser's eruption from the second-floor outdoor balcony of the Old Faithful Inn, another national treasure.