Sergey Gorshkov / Steam emitted from geysers, Geyser River, Valley of Geysers, Kamchatka, Russia

Sergey Gorshkov / Steam emitted from geysers, Geyser River, Valley of Geysers, Kamchatka, Russia

Sergey Gorshkov / Geyser River and geysers in background, Valley of Geysers, Kamchatka, Russia

Jeff Vanuga / Bull Bison (Bison bison) warming himself in the steam from the Firehole River, Upper Geyser Basin, Yellowstone National Park, Wyoming, USA, January

Igor Shpilenok / Water flowing over rapids in the Geyser River, Kronotsky Zapovednik, Kamchatka, Far East Russia

Igor Shpilenok / The 'Fireplace' rock formation, Geyser River, Valley of the Geysers, Kronotsky Zapovednik Reserve, Russia.

John Shaw / South Scalloped Spring with thermophilic algae, on the bank of the Firehole River, Upper Geyser Basin, Yellowstone National Park, Wyoming, USA. January.

Jeff Vanuga / Bison (Bison bison), two crossing the Firehole River, Fountain Flat, Lower geyser basin, Yellowstone National Park, Wyoming. September.

Kirkendall-Spring / Riverside Geyser on the banks of Firehole River, Upper Geyser Basin, Yellowstone National Park, Wyoming, USA. September 2015.

Jeff Vanuga / Artemisia Geyser along the Firehole River. Upper Geyser Basin, Yellowstone National Park, Wyoming, USA, September 2014.

Kirkendall-Spring / Riverside Geyser along the Firehole River in the Upper Geyser Basin of Yellowstone National Park, Wyoming, USA. June 2013.

Duncan Usher / American Bison (Bison bison) pair grazing beside Firehole River, Midway Geyser Basin, Yellowstone National Park, Wyoming

Jeff Vanuga / Fortress Geyser in the Firehole River Group. Lower Geyser Basin, Yellowstone National Park, Wyoming, September 2010.

Juan Carlos Munoz / Strokkur geyser errupting. The geyser is in the geothermic region beside the Hvítá River. Iceland, July 2009

Sergey Gorshkov / Steam emitted from geysers, Geyser River, Valley of Geysers, Kamchatka, Russia

Sergey Gorshkov / Steam emitted from geysers, Geyser River, Valley of Geysers, Kamchatka, Russia

Jeff Vanuga / Steam rising from Firehole River in Upper Geyser Basin, Yellowstone National Park, Wyoming, USA, October 2008

Jeff Vanuga / Thermal hot springs along the Firehold River, Upper Geyser Basin, Yellowstone National Park, Wyoming, USA, October 2008

Jeff Vanuga / Thermal hot springs along the Firehold River, Upper Geyser Basin, Yellowstone National Park, Wyoming, USA, October 2008

Igor Shpilenok / Brown bear in Valley of the Geysers, Geyser River, Kronotsky Zapovednik, Kamchatka, Far East Russia, 2006 (one year before the landslide of June 3, 2007, blocked part of the Valley of the Geysers, d...

Igor Shpilenok / Stain glass wall and Geyser River in the Valley of the Geysers, Kronotsky Zapovednik, Kamchatka, Far East Russia, May 2006. Brown bears like to gather in the warm valley in spring to feed on fresh gra...

Igor Shpilenok / Helicoptor flying over the visitor centre and a landslide in Valley of the Geysers, Kronotsky Zapovednik, Kamchatka, Far East Russia, June 2007. The landslide stopped short of the visitor's center on...

Igor Shpilenok / Aerial view of the landslide of June 3, 2007, which blocked part of Kamchatka's Valley of the Geysers, damning the Geyser River and creating a lake. This picture was taken on June 15, six days after t...

Igor Shpilenok / Stain glass wall and Geyser River in the Valley of the Geysers, Kronotsky Zapovednik, Kamchatka, Far East Russia, May 2006.

Igor Shpilenok / Aerial view of the Ranger stations after the landslide of June 3, 2007, which changed the face of the Valley of the Geysers, Kronotsky Zapovednik, Kamchatka, Far East Russia During the landslide of J...

Igor Shpilenok / Geyser River, with its steaming geysers, Kronotsky Zapovednik, Kamchatka, Far East Russia.

Igor Shpilenok / Panoramic of Autumn colours in the Valley of the Geysers, Geyser river, Kronotsky Zapovednik, Kamchatka, Far East Russia

Igor Shpilenok / Autumn on the Geyser River, Valley of the Geysers, Kronotsky Zapovednik, Kamchatka, Far East Russia October 2005, (nearly two years before a landslide on June 3, 2007 changed the face of the valley)

Igor Shpilenok / The Geyser River flows through the Valley of the Geysers, cloaked in autumn colours, Kronotsky Zapovednik, Kamchatka, Far East Russia

Igor Shpilenok / The Geyser River and its geysers, Valley of the Geysers, Kronotsky Zapovednik, Kamchatka, Far East Russia, June 2005 (two years before a landslide changed the face of the valley forever)

Igor Shpilenok / The Geyser River turned lake, Kronotsky Zapovednik, Kamchatka, Far East Russia The Geyser River, which carved the canyon known as the Valley of the Geysers, turned into a lake after the landslide of...

Igor Shpilenok / Ants climbing up plant stem to avoid flood water, after the landslide of June 3, 2007 blocked part of Kamchatka's Valley of the Geysers, damning the Geyser River and creating a lake. Kronotsky Zapoved...

Igor Shpilenok / Ants climbing up plant stem to avoid flood water, after the landslide of June 3, 2007 blocked part of Kamchatka's Valley of the Geysers, damning the Geyser River and creating a lake. Kronotsky Zapoved...

Igor Shpilenok / Geyser River canyon after the landslide on June 3, 2007, blocked the valley and formed a lake submerging many of the geysers, Kronotsky Zapovednik, Kamchatka, Far East Russia

Jeff Vanuga / Excelsior Geyser spilling over 4000 gallons per minute of boiling water into the Firehole River (it is considered to be the largest Geyser in the world), Yellowstone National Park, Wyoming, USA

Jeff Vanuga / Excelsior Geyser spilling over 4000 gallons per minute of boiling water into the Firehole River (far right), Midway Geyser Basin, Yellowstone National Park, Wyoming, USA (It is considered to be the la...

Jeff Vanuga / Bison {Bison bison} feeding along Firehole River, Midway Geyser Basin, Yellowstone National Park, Wyoming, USA

George McCarthy / Riverside Geyser, Firehole River, Yellowstone National Park, Wyoming, USA

Igor Shpilenok / Geyser River near Death Valley, Kronotsky Zapovednik Reserve, kamchatka, Russia

Igor Shpilenok / Geyser River, Valley of the Geysers, Kronotsky Zapovednik Reserve, Kamchatka, Russia.

Igor Shpilenok / Geyser River, Valley of the Geysers, Kronotsky Zapovednik Reserve, Kamchatka, Russia.

Igor Shpilenok / Zhemchuzhny or 'Pearl' Geyser, Geyser River, Kronotsky Zapovednik Reserve, Kamchatka, Russia.

Igor Shpilenok / Horizontal Geyser feeding hot water into Geyser River, Valley of the Geysers, Kronotsky Zapovednik Reserve, Kamchatka, Russia.

Igor Shpilenok / Steaming geyser and river, Valley of the Geysers, Kronotsky Zapovednik Reserve, Kamchatka, Russia

Igor Shpilenok / The Troinoy (Triple) Waterfall on Geyser River resemble an hourglass, Russia.

Jeff Foott / Chocolate Geyser, Gibbon River, Yellowstone National Park, Wyoming

Jeff Foott / Chocolate Geyser, Gibbon River, Yellowstone National Park, Wyoming

Duncan Usher / Steam rising from Excelsior Geyser Crater, Firehole River, Midway Geyser Basin, Yellowstone National Park, Wyoming

Duncan Usher / Active geysers on the Yellowstone River east of Dragon's Mouth Spring, Yellowstone National Park, Wyoming

Kirkendall-Spring / Riverside Geyser erupting along the Firehole River, Upper Geyser Basin, Yellowstone National Park, Wyoming, USA. June, 2013.

David Welling / Firehole river flowing over Firehole Falls during snowy winter, Yellowstone National Park, Wyoming, USA.

Eric Baccega / Strokkur geyser erupting, Hvita River, Haukadalur valley, Iceland.

Jeff Foott / South Scalloped Spring and Firehole River, Upper Geyser Basin, Yellowstone National Park, Wyoming

Jeff Foott / Water flowing from hot spring into river, Grand Prismatic Pool, Firehole River, Midway Geyser Basin, Yellowstone National Park, Wyoming