Although The Great Geysir or Stori-Geysir is also included in the famous “Golden Circle Tour,” it has been dormant since 1916 when it stopped spouting. It is thought that it first came to life around the end of the Thirteenth Century when a series of earthquakes and eruption of Mt. Hekla hit the geothermal valley where Geysir is located. It then spouted every third hour or so, blasting a jet of water and steam as high as 60-80 meters/196-262 feet high. It is said that park authorities occasionally dump tons of carbolic soap powder into its mouth in an attempt to wake up Great Geysir.