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Castle Geyser at sunset, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Sawmill Geyser erupts, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Geothermal river at sunrise at Chalviri Salt Flats (Salar de Chalviri), Altiplano of Bolivia, South America

White Island (Whakaari) active marine volcano in the Bay of Plenty, North Island, New Zealand, Pacific

Old Faithful Geyser erupting, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Tourists in hot springs of Termas de Polques on the Altiplano, Potosi Department, Bolivia, South America

Mammoth Hot Springs terraces, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Tourists on boardwalk over the mineral runoff from Grand Prismatic Spring, Midway Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Steam engine and passenger carriage on trip down Snowdon Mountain Railway, Snowdonia National Park, Gwynedd, Wales, United Kingdom, Europe

Palette Spring, Mammoth Hot Springs, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Brink of Lower Falls of Yellowstone River, Grand Canyon of the Yellowstone, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Tourists looking at Seismograph and Bluebell pools, West Thumb Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Mammoth Hot Springs terraces, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Tourists exploring White Island Volcano, an active volcano in the Bay of Plenty, North Island, New Zealand, Pacific

Old steam locomotive, Furnace Creek, Death Valley, California, United States of America, North America

Wooden boardwalk and cyanobacteria thermophile formations on Geyser Hill, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

An active andesite stratovolcano on White Island, off the east side of North Island, New Zealand, Pacific

Visitors at Cistern Spring, Norris Geyser Basin, Yellowstone UNESCO World Heritage Site, Wyoming, United States of America, North America

Old Faithful Geyser erupting in summer evening light, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Old Faithful Geyser erupting in summer evening light, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Grand Geyser erupting, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Palette Spring, Mammoth Hot Springs, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Eruption of Castle Geyser with rainbow in the spray, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Cistern Spring, Norris Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Riverside Geyser, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Old Faithful Geyser, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Mount St. Helens, with steam plume from rising dome within crater, seen from Johnston Ridge Visitor Centre, Washington state, United States of America, North America

Minor eruption from Steamboat Geyser, Norris Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Castle Geyser steam blocks sun, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

White Island (Whakaari) active marine volcano in the Bay of Plenty, North Island, New Zealand, Pacific

Devil's Thumb and Palette Spring, Mammoth Hot Springs, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Castle Geyser, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Rusting old steam locomotives at the Train cemetery (train graveyard), Uyuni, Southwest, Bolivia, South America

Riverside Geyser, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Oblong Geyser, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Crested Pool, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Castle Geyser, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Thermal springs, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Castle Geyser, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Water rich in blue-green algae (cyanobacteria), mineral salts and fine silica mud at the geothermal spa that owes its existence to the Svartsengi geothermal power plant, Blue Lagoon, near Reykjavik, Iceland, Polar Regions

Water rich in blue-green algae (cyanobacteria), mineral salts and fine silica mud at the geothermal spa that owes its existence to the Svartsengi geothermal power plant, Blue Lagoon, near Reykjavik, Iceland, Polar Regions

The train driver and engine of the Durango and Silverton passenger steam train, Colorado, United States of America, North America

A steam train on the railway originally built to transport the sugar cane crop, in the Valle de los Ingenios, central Cuba, West Indies, Central America

Strokkur Geysir erupting at sunrise on a freezing winter's morning against the colourful sky, Geysir, Haukardalur Valley, Iceland, Polar Regions

Elevated view over Djemaa el-Fna in the evening when the square is filled with food stalls, Marrakech (Marrakesh), Morocco, North Africa, Africa

Palette Spring, Travertine Terraces, Mammoth Hot Springs, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Grand Prismatic Spring, Midway Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Hverir geothermal fields at the foot of Namafjall mountain, Myvatn Lake area, Iceland, Polar Regions

El Tatio Geysers, at 4300m above sea level El Tatio is the world's highest geyser field, the area is ringed by volcanoes and fed by 64 geysers, Atacama Desert, Norte Grande, Chile, South America

Lone American bison with steaming thermal features in the snow, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Uyghur Muslim man cooking noodles at noodle stall in Kashgar Sunday Market, Kashgar, Xinjiang, China, Asia

Hot volcanic steam rising into monsoon clouds from Kawah Ratu (Queen's Crater) of Mount Tangkuban, Perahu, Bandung, Java, Indonesia, Southeast Asia, Asia

Hot volcanic steam rising into monsoon clouds from Kawah Ratu (Queen's Crater) of Mount Tangkuban, Perahu, Bandung, Java, Indonesia, Southeast Asia, Asia

View of a waterfall on the Bergen Railway route from Myrdal to the town of Flam, Norway, Scandinavia, Europe

Frankfurter sausages on Christmas Market stall in Old Market Square at dusk, Nottingham, Nottinghamshire, England, United Kingdom, Europe

Arid soil on edge of the smoky Erta Ale volcano from above, Danakil Depression, Afar Region, Ethiopia, Africa

Two year old boy and Mother in old steam train carriage pointing out of window, Bluebell Railway, Sussex, England, United Kingdom, Europe

Panoramic aerial view of the active Erta Ale volcano caldera, Danakil Depression, Afar Region, Ethiopia, Africa

Panoramic aerial view of sunset over the active Erta Ale volcano crater, Danakil Depression, Afar Region, Ethiopia, Africa