Almost every visitor includes the world's most famous geyser on his or her itinerary. Yellowstone's most predictable big geyser—although not its largest or most regular—sometimes reaches 180 feet, but it averages 130 feet. Sometimes it doesn't shoot as high, but in those cases the eruptions usually last longer. The mysterious plumbing of Yellowstone has lengthened Old Faithful's cycle somewhat in recent years, to every 94 minutes or so. To find out when Old Faithful is likely to erupt, check at the visitor center or at any of the lodging properties in the area. You can view the eruption from a bench just yards away, from the dining room at the lodge cafeteria, or from a guest room at the spectacular Old Faithful Inn (assuming you are lucky enough to spend the night there). The 1-mi hike to Observation Point yields yet another view—from above—of the geyser and its surrounding basin.
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