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Hot pools and boiling mud at Namaskard thermal area, Hverarond, near Lake Myvatn, North area, Iceland, Polar Regions
People enjoy the outdoor pools at the Szechenyi Thermal Baths, Budapest, Hungary, Europe
Champagne Pool, Wai-O-Tapu Thermal Wonderland, Rotorua, Bay of Plenty, North Island, New Zealand, Pacific
The Szechenyi Thermal Baths, the largest medicinal bath in Europe, Budapest, Hungary, Europe
Yellow acid sulphur sediments in the thermal area of Dallol, Danakil Depression, Afar Region, Ethiopia, Africa
Lone American bison with steaming thermal features in the snow, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Geyser in the thermal area at Rotorua, South Auckland, North Island, New Zealand
Snowscape of reflection of sky in thermal feature, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Saint-Gervais Mont-Blanc thermal spa in the French Alps, Haute-Savoie, France, Europe
Tourists around the hot mud pools at Namaskard thermal area, Hverarond, near Lake Myvatn, North area, Iceland, Polar Regions
Grand Prismatic Spring, Midway Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
A thermal mud pool bubbles near to Wai-o-tapu Thermal Wonderland, Rotorua, North Island, New Zealand, Pacific
Thermal Baths, Budapest, Hungary, Europe
Blue thermal feature shrouded in fog, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Tourists around the steam jets at Namaskard thermal area, Hverarond, near Lake Myvatn, North area, Iceland, Polar Regions
Lone American bison with steaming thermal features in the snow, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Steam jet at Namaskard thermal area, Hverarond, near Lake Myvatn, North area, Iceland, Polar Regions
Leirhnjukur thermal area and eruption site near Krafla geothermal power station, Lake Myvatn, North area, Iceland, Polar Regions
Men play chess at the outdoor pools at the Szechenyi Thermal Baths, Budapest, Hungary, Europe
Yellowstone thermal features emit steam backlit by sun, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North AmericaWyoming, USA
View of Roman Thermal Baths, Kos Town, Kos, Dodecanese, Greek Islands, Greece, Europe
Wai-O-Tapu Thermal Wonderland, Rotorua, Bay of Plenty, North Island, New Zealand, Pacific
Namaskard thermal area, Hverarond, near Lake Myvatn, North area, Iceland, Polar Regions
Grand Prismatic Spring, Midway Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Caracalla Thermal Bath, Baden-Baden, Black Forest, Baden-Wurttemberg, Germany, Europe
Saint-Gervais Mont-Blanc thermal spa, woman enjoying spa and wellness treatment in winter, Haute Savoie, France, Europe
Wai-O-Tapu Thermal Wonderland, Rotorua, Bay of Plenty, North Island, New Zealand, Pacific
Champagne Pool, Wai-O-Tapu Thermal Wonderland, Rotorua, Bay of Plenty, North Island, New Zealand, Pacific
Hot steam, Craters of the Moon Thermal Area, Taupo, North Island, New Zealand, Pacific
Crested Pool, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Saint-Gervais Mont-Blanc thermal spa, woman enjoying spa and wellness treatment in winter, Haute Savoie, France, Europe
Capitals, thermal bath, Tolemaide (Ptolemais), Cyrenaica, Libya, North Africa, Africa
Szechenyi Thermal Bath, Budapest, Hungary, Europe
Daisy Geyser, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Ruins of Roman Terme di Nerone thermal baths at Largo Parlascio Square, Pisa, Tuscany (Toscana), Italy, Europe
Craters of the Moon Thermal Area, Taupo, North Island, New Zealand, Pacific
Mud pots at Hverir Thermal Area, Iceland, Polar Regions
Bright blue thermal feature in snow, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Midway Geyser Basin thermal activity from the Fairy Creek Trail, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Szechenyi Thermal Bath, Budapest, Hungary, Europe
Caracalla Thermal Bath, Baden-Baden, Black Forest, Baden-Wurttemberg, Germany, Europe
Mud pots at Hverir Thermal Area, Iceland, Polar Regions
Snowscape of thermal feature with reflection, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Forum thermal baths, Ostia Antica, Lazio, Italy, Europe
View of the grand thermal baths, Villa Adriana (Hadrian's Villa), UNESCO World Heritage Site, Tivoli, Lazio, Italy, Europe
Colourful thermal features, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Trees crusted in frost and thermal features, cold Autumn (Fall) day, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Trees reflected in thermal feature in the snow, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Midway Geyser Basin thermal activity from the Fairy Creek Trail, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Blue thermal feature in the fog and snow, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Freezing mists and thermal features, dawn, West Thumb Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Trees crusted in frost and thermal features, cold Autumn (Fall) day, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Thermal power station, Sabarmati, Ahmedabad, Gujarat, India, Asia
Geo-thermal power plant in the Svartsengi (Black Field) Area, the Blue lagoon is popular with bathers and good for skin complaints, Svartsengi, Iceland, Polar Regions
Beauty Pool in Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America
Pohutu geyser, Whakarewarewa, Rotorua thermal area, South Auckland, North Island, New Zealand, Pacific
Geyser at Geysir thermal area, near Reykjavik, Iceland, Polar Regions
Blue lagoon, Svarsengi geothermal plant, Iceland, Polar Regions
Ilica thermal mud baths claimed to cure rheumatism, Dalyan, Anatolia, Turkey, Asia Minor, Eurasia
Bathing in Blue Lagoon, Svartsenga Geo-Thermal Plant, Iceland, Polar Regions
Terraced travertine thermal pools, Pamukkale, UNESCO World Heritage Site, Anatolia, Turkey, Asia Minor, Eurasia
People bathing in Gellert Thermal Baths, Budapest, Hungary, Europe
View of outside thermal spa at Szechenhu Thermal Bath in winter, Budapest, Hungary, Europe
Terme Stabiane interior. 2nd century BC thermal complex, Stabian Baths, with columns at porticoed gym area, Pompeii, UNESCO World Heritage Site, Campania, Italy, Europe
Wahaio Traditional Maori meeting house, Whare Tipuna, Whakarewarewa thermal village, Rotorua, North Island, New Zealand, Pacific
People bathing in Gellert Thermal Baths, Budapest, Hungary, Europe
Geyser at Geysir thermal area, near Reykjavik, Iceland, Polar Regions
Pipeline carrying steam through the Wairakei Thermal Valley, North Island, New Zealand, Pacific
Terraced travertine thermal pools, Pamukkale, UNESCO World Heritage Site, Anatolia, Turkey, Asia Minor, Eurasia
El Tatio geyser, Atacama, Chile, South America
View of outside thermal spa at Szechenhu Thermal Bath in winter, Budapest, Hungary, Europe
Champagne Pools steaming, Waiotapu thermal reserve, Rotorua, South Auckland, North Island, New Zealand, Pacific
Bubbling mud pot in the Whakarewarewa thermal area at Rotorua, South Auckland, North Island, New Zealand, Pacific
Clouds of steam rise as people swim in the Blue Lagoon thermal pool, Iceland
Champagne Pools steaming, Waiotapu thermal reserves, Rotorua, South Auckland, North Island, New Zealand, Pacific
Mount Fuji (3776m), Owakidani geothermal park, Hakone, Honshu Island, Japan, Asia
Red Maori carving, Marai meeting house, Whakarewarewa thermal village, Wahiao, Rotorua, North Island, New Zealand, Pacific
Outdoor pool with men and women at Szechenyi Thermal Baths, Budapest, Hungary, Europe
Castle Geyser, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America
Erupting geysers and mineral terraces, Whakarewarewa thermal area, Rotorua, South Auckland, North Island, New Zealand, Pacific
BlueLagoon thermal pool, Iceland
Steam rising in the Whakarewarewa Thermal Reserve in Rotorua, South Auckland, North Island, New Zealand, Pacific
The Lady Knox Geyser in the Waiotapu Thermal Area at Rotorua, North Island, New Zealand, Pacific
Thermal activity, Karapiti area, Taupo, South Auckland, North Island, New Zealand, Pacific
Guests enjoy the thermal waters of the Blue Lagoon (Blaa Ionid), Iceland, Polar Regions
People bathing in Gellert Thermal Baths, Budapest, Hungary, Europe
Craters of the Moon thermal power station, Huka, South Auckland, North Island, New Zealand, Pacific
View of outside thermal spa at Szechenhu Thermal Bath in winter, Budapest, Hungary, Europe
Castle and Sawmill Geysers in eruption in Old Faithful Geyser Basin in winter, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America
Outdoor pool with men and women at Szechenyi Thermal Baths, Budapest, Hungary, Europe
Guests enjoy the thermal waters of the Blue Lagoon (Blaa Ionid), Iceland, Polar Regions
Tourists visiting the Whakarewarewa Thermal Reserve in Rotorua, South Auckland, North Island, New Zealand, Pacific
People bathing in Gellert Thermal Baths, Budapest, Hungary, Europe
Aerial view of Wairakei thermal power area, North Island, New Zealand, Pacific
Steam fumaroles in geothermal field, Sol de Manana, near Laguna Colorado, Southwest Highlands, Bolivia, South America
Clouds of steam rise as people swim in the Blue Lagoon thermal pool, Iceland
View of outside thermal spa at Szechenhu Thermal Bath in winter, Budapest, Hungary, Europe
Leirhnjukur thermal area and eruption site, near Krafla geothermal power station, Lake Myvatn, North area, Iceland, Polar Regions
Geothermal steam from geyser vent between eruptions, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America
Ornate entrance interior of Gellert Thermal Baths, Budapest, Hungary, Europe