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Morning Glory Pool, a geothermal pool, colours are due to algae at temperature bands, hotter below, Yellowstone National Park, Wyoming, USA
Porcelain Basin, Norris Geyser Basin, 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
Pool runoff of orange bacteria and algae (Therophiles), Grand Prismatic Pool, Midway Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Walkway, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America
Food being cooked on volcanic grill at visitor centre, Parque Nacional de Timanfaya, national park, Lanzarote, Canary Islands, Atlantic, Europe
Hot bubbling mud pool at Orakei Korako Thermal Park, The Hidden Valley, North Island, New Zealand, Pacific
Firehole Spring, Firehole Lake Drive, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Mammoth Hot Springs, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Tourists watching Old Faithful Geyser, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Old Faithful geyser blowing, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Geothermal steam, frosted trees and snow-free hot ground in Norris Basin in winter, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America
Turquoise Pool, Midway Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Devil's Thumb, Mammoth Hot Springs, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North  America
Steam fumaroles in Jigokudani geothermal area, Noboribetsu Onsen, Shikotsu-Toya National Park, Hokkaido, Japan
Steaming geothermal area at Orakei Korako Thermal Park, The Hidden Valley, North Island, New Zealand, Pacific
Mammoth Hot Springs, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Mammoth Hot Springs, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Morning Glory Pool in Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Mammoth Hot Springs, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Norris Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Mammoth Hot Springs, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Excelsior Geyser Crater, Midway Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Emerald Spring in Norris Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Blue holes and white crystals, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Firehole Spring, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Blue holes and white crystals, 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
Mammoth Hot Springs terraces, 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
Firehole Spring, 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
Mammoth Hot Springs terraces, 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
Firehole Spring, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Palette Spring, Travertine Terraces, Mammoth Hot Springs, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
View of snow covered landscape in Thingvellir National Park, UNESCO, in winter, Western Region, Iceland
Grand Prismatic Spring, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Belgian Pool, in the Norris Geyser Basin area, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
View of geysers at Geysir Hot Springs in winter, Western Region, Iceland
A view of the boiling mud at Namafjall, Iceland
Rainbow Geyser and surreal the colors that the different bacteria create in these geysers, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Belgian Pool, in the Norris Geyser Basin area, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Large carved face at Bukit Kasih, a volcanic tourist park with fumarole fields, a world peace themed tower and worship houses of five major religions, Bukit Kasih, Minahasa, North Sulawesi, Indonesia, Southeast Asia, Asia
Steaming volcanic fumarole field at Bukit Kasih, a tourist park with a world peace themed tower and worship houses of five major religions, Bukit Kasih, Minahasa, North Sulawesi, Indonesia, Southeast Asia, Asia
Steaming fumarole field at Bukit Kasih, a tourist volcanic park with a world peace themed tower and worship houses of five major religions, Bukit Kasih, Minahasa, North Sulawesi, Indonesia, Southeast Asia, Asia
Steaming fumarole field at Bukit Kasih, a tourist volcanic park with a world peace themed tower and worship houses of five major religions, Bukit Kasih, Minahasa, North Sulawesi, Indonesia, Southeast Asia, Asia
Grand Prismatic Spring, Midway Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Rainbow Geyser, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Steaming fumarole field at Bukit Kasih, a tourist park with a world peace themed tower and worship houses of five major religions, Bukit Kasih, Minahasa, North Sulawesi, Indonesia, Southeast Asia, Asia
Grand Prismatic Spring, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Cliff Geyser erupting in the Black Sand Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Rainbow Geyser and surreal the colors that the different bacteria create in these geysers, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Porcelain Springs, Norris Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Steaming volcanic fumarole field at Bukit Kasih, a tourist park with a world peace themed tower and worship houses of five major religions, Bukit Kasih, Minahasa, North Sulawesi, Indonesia, Southeast Asia, Asia
Worship houses of five major religions at Bukit Kasih, a volcanic tourist park with a world peace themed tower, Bukit Kasih, Minahasa, North Sulawesi, Indonesia, Southeast Asia Asia
Old Faithful, a cone geyser, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Pathway through steaming Sulphur pits, Hell Valley, Shikotsu-Toya National Park, Noboribetsu, Hokkaido, Japan, Asia
Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Steaming fumarole field at Bukit Kasih, a tourist park with a world peace themed tower and worship houses of five major religions, Bukit Kasih, Minahasa, North Sulawesi, Indonesia, Southeast Asia, Asia
Daisy Geyser, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Grand Prismatic Spring, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Geothermal mud pot in Biscuit Basin in Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Pathway through steaming Sulphur pits, Hell Valley, Shikotsu-Toya National Park, Noboribetsu, Hokkaido, Japan, Asia
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
Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Hell Valley at Shikotsu-Toya National Park, Noboribetsu, Hokkaido, Japan, Asia
Canary Spring, Travertine Terraces, Mammoth Hot Springs, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
West Thumb Geyser Basin in Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Grand Prismstic Spring, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Kuirau Park, geothermics, Rotorua, Bay of Plenty, North Island, New Zealand, Pacific
Old Faithful Geyser, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Grand Prismatic Spring and bacterial mats, Midway Geyser Basin, Yellowstone National Park, Teton County, Wyoming, United States of America, North America
Grand Prismatic Spring and bacterial mats, Midway Geyser Basin, Yellowstone National Park, Teton County, 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
Colourful Emerald Pool, Black Sand Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Hot Springs, Lower Geyser Basin, Yellowstone National Park, Wyoming, United States of America, North America
Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Opalescent pool in the Black Sand Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Hot Springs, Lower Geyser Basin, Yellowstone National Park, Wyoming, United States of America, North America
Grand Prismatic Spring and bacterial mats, Midway Geyser Basin, Yellowstone National Park, Teton County, Wyoming, United States of America, North America
Erupting Old Faithful Geyser, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America