Yellowstone attracts 3 million visitors annually. Its symbol is Old Faithful, a large cone geyser that erupts about every hour. It shoots steam and boiling water 150’ into the air. The park is filled with active thermal areas that include a collection of the world’s most extraordinary geysers, steam vents, boiling cauldrons of hot water and mud, and hot, cascading mineral laden water. These would be enough to satisfy every visitor, but there’s more.