Old Faithful

One of the most famous geysers in the nation, Old Faithful got its name because of its predictability. Perhaps this is the reason why this geothermal eruption is so famous - people know they'll get a show as long as they wait about an hour to an hour and a half. Old Faithful's steamy eruptions, which reach a height of about 106 to 185 feet, last from 2 to 5 minutes. When it was first discovered in 1870, it was used as a laundromat. It wouldn't be advisable to use it as such nowadays; doing so might get you escorted out of Yellowstone.