Old Faithful Geyser & Inn Yellowstone Park, Vintage Yellowstone National Park Postcards Old Faithful Geyser & Inn in the winter, Yellowstone National Park Wyoming The most famous geyser in Yellowstone Park, and perhaps the world, is Old Faithful Geyser, located in Upper Geyser Basin. Castle Geyser, Lion Geyser and Beehive Geyser are in the same basin. The park contains the largest active geyser in the world—Steamboat Geyser in the Norris Geyser Basin. There are 300 geysers in Yellowstone and a total of at least 10,000 geothermal features altogether. Half the geothermal features and two-thirds of the world's geysers are concentrated in Yellowstone.