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Geysers in Yellowstone Park, West Yellowstone, Montana, United States of America (U.S.A.), North America

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

Lava flowing from Kilauea Volcano, Hawaii Volcanoes National Park, UNESCO World Heritage Site, The Big Island, Hawaii, United States of America, North America

Hot pools and steam from Strokkur Geysir at sunrise, winter, at geothermal area beside the Hvita River, Geysir, Iceland, Polar Regions

Rock formations, Chesler Park, The Needles district, Canyonlands National Park, Utah, United States of America, North America

Steaming volcanic mud pools, Rincon de la Vieja National Park at foot of Rincon Volcano, Gaunacaste, Costa Rica

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

Excelsior Pool, Midway Geyser Basin, 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

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

Hot stream detail at Orakei Korako Thermal Park, The Hidden Valley, North Island, New Zealand, Pacific

Sandstone pinnacles, Chesler Park, The Needles district, Canyonlands National Park, Utah, United States of America, North America

Geothermal activity of mudpots, hot springs and fumaroles, at Krisuvik (Krysuvik-Seltun), Reykjanes Peninsula, south-west Iceland, Iceland, Polar Regions

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

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

Hot pools and steam from Strokkur Geysir at sunrise, winter, at geothermal area beside the Hvita River, Geysir, Iceland, Polar Regions

Tourists watching geothermal activity of mudpots, hot springs and fumaroles, at Krisuvik (Krysuvik-Seltun), Reykjanes Peninsula, south-west Iceland, Iceland, Polar Regions

The site of the Commandants House showing supports for suspended floor system with hot air to heat rooms above, dating from AD138, Cilurnum (Chesters Roman Fort), Hadrian's Wall, UNESCO World Heritage Site, Chollerford, Northumbria National Park, England, United Kingdom, Europe

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

Palette Spring, Mammoth Hot Springs, 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

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

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

Palm tree groves and ancient village at foot of tall gorges, Ziz Valley, Atlas mountains, Morocco, North Africa, Africa

Lava flow from the Monti Calcarazzi fissure that threatened Nicolosi on the south flank of Mt. Etna, Sicily, Italy, EuropeThe Piano del Lago cone (above) destroyed the Sapienza cable car.

Old mosque in a kasbah framed by palm tree groves, Dades, Atlas mountains, Ouarzazate province, Morocco, North Africa, Africa

Clothes for sale hanging on rocks at the famous Todra gorges, Tinghir, Atlas mountains, Ouarzazate province, Morocco, North Africa, Africa

Romantic sunrise over the ancient fortress or Kasbah Amridil, Skoura, Atlas mountains, Ouarzazate province, Morocco, North Africa, Africa

A majestic road crossing the beautiful Valley of Fire, Nevada, United States of America, North America

A majestic road crossing the beautiful Valley of Fire, Nevada, United States of America, North America

Family with one child enjoying a camel ride in the desert, Erg Chebbi, Merzouga, Sahara Desert, Morocco, North Africa, Africa

Tuareg man leading a camel train of tourists on the sand dunes of Erg Chebbi, Merzouga, Sahara Desert, Morocco, North Africa, Africa

Street performers in front of houses, restaurants and cafes at dusk, Old Town Square (Rynek Stare Miasto), UNESCO World Heritage Site, Warsaw, Poland, Europe

Street performers in front of houses, restaurants and cafes at dusk, Old Town Square (Rynek Stare Miasto), UNESCO World Heritage Site, Warsaw, Poland, Europe

Palm trees surrounding the historic fortified residence (kasbah) of Amridil, Skoura, Atlas mountains, Ouarzazate province, Morocco, North Africa, Africa

Ancient kasbah surrounded by palm trees, Ounila Valley, Atlas mountains, Ouarzazate province, Morocco, North Africa, Africa

Thorny devil (Moloch horridus) walks on red sand in Desert Park at Alice Springs, Northern Territory, Central Australia, Pacific

Dry river bed with red sand in Desert Park at Alice Springs near MacDonnell Ranges in Northern Territory, Central Australia, Pacific

Tomb (Mastaba) of Seshem Nefer Theti, Great Pyramids of Giza, UNESCO World Heritage Site, Giza, Egypt, North Africa, Africa

Yellow acid sulphur sediments in the thermal area of Dallol, Danakil Depression, Afar Region, Ethiopia, Africa