So This is Old Faithful. Its a Geyser in Yellowstone National Park. Its one of the US's Most Famous land Marks.. People from all over the world travel to see this Geyser blow every 45 to 120 minutes. My Wait was only about 15 minutes. and it last all of about 45 seconds. Its one of the Tallest Geysers in the US.. there is on on site that is much higher but not as predictable.. I have a feeling this one is on a switch and they have been fooling the world for years..