Almost every visitor's itinerary includes the world's most famous geyser. Yellowstone's most predictable big geyser—although not its largest or most regular—sometimes reaches 180 feet, but it averages 130 feet. 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, at any of the lodging properties in the area, or by
calling the geyser prediction line at 307/344–2751. You can view the eruption from a bench just yards away, from the dining room at the lodge cafeteria, or the second-floor balcony of Old Faithful Inn. The 1-mile hike to Observation Point yields yet another view—from above—of the geyser and its surrounding basin.
Southwest segment, Grand Loop Rd., Yellowstone National Park, Wyoming, USA