1350-4951 - Strokkur geyser erupting, in the Geysir hot springs area, Haukadalur geothermal area, Southwest Iceland

1160-4527 - Champagne Pool, Wai-O-Tapu Thermal Wonderland, Rotorua, Bay of Plenty, North Island, New Zealand, Pacific

1160-4528 - Champagne Pool, Wai-O-Tapu Thermal Wonderland, Rotorua, Bay of Plenty, North Island, New Zealand, Pacific

746-89480 - Sapphire Pool in Biscuit Basin, Yellowstone National Park, Wyoming.

746-89396 - Black Opal Pool in Biscuit Basin, Yellowstone National Park, Wyoming.

746-89406 - Sapphire Pool in Biscuit Basin, Yellowstone National Park, Wyoming.

746-89371 - Creek and pool in Biscuit Basin, Yellowstone National Park, Wyoming.

1113-102865 - Blue Lagoon, Storm, Lake, Lava, Grindavík, Reykjanes, Iceland, Europe

746-9086 - Outdoor thermal pool with hydromassage, Porto Mannu thalassotherapy centre, Palau, Sardegna, Italy

832-368316 - Blue water pool, Bl√°hver hot spring, Hveravellir high-temperature or geothermal region, Highlands, Iceland, Europe

832-368096 - Morning Glory Pool, a hot spring in Upper Geyser Basin, Yellowstone National Park, Wyoming, USA

832-368317 - Blue water pool, Bl√°hver hot spring, Hveravellir high-temperature or geothermal region, Highlands, Iceland, Europe

832-368089 - Crested Pool, a hot spring in Upper Geyser Basin, Yellowstone National Park, Wyoming, USA

832-368090 - Morning Glory Pool, a hot spring in Upper Geyser Basin, Yellowstone National Park, Wyoming, USA

832-368094 - Crested Pool, a hot spring in Upper Geyser Basin, Yellowstone National Park, Wyoming, USA

832-342990 - Firehole Spring in Lower Geyser Basin, Yellowstone National Park, Wyoming, USA

832-342987 - Chromatic Spring in Upper Geyser Basin, Yellowstone National Park, Wyoming, USA

832-323322 - Thermal pool, Wohlfuehltherme, Feel Good thermae, Bad Griesbach, Lower Bavaria, Germany, Europe

832-312125 - Demonstration of the geothermal energy in the National park Timanfaya, Lanzarote, Canary Islands, Spain

832-304424 - Myvatn Pool (Jarboein vi M˝vatn), Myvatn, northern Iceland, Iceland, Atlantic Ocean

832-304426 - Myvatn Pool (Jarboein vi M˝vatn), Myvatn, northern Iceland, Iceland, Atlantic Ocean

832-302567 - Break of dawn at the waterside of Yellowstone Lake, Yellowstone National Park, Wyoming, USA, United States of America

832-302564 - Break of dawn at the waterside of Yellowstone Lake, Yellowstone National Park, Wyoming, USA, United States of America

832-259891 - Three Icelandic women with beer in the warm spring, hot pool, Landmannalaugar, Iceland, Europe

832-259877 - Hot, bubbling mud in a pool in the Gunnuhver geothermal area, Iceland, Europe

832-259864 - Blahver, blue spring, the most beautiful blue water pool in Hveravellir in the Highlands, in front of Oeskjuholt, a steaming calc-sinter mound which looks like a mini volcano, Hveravellir, Iceland, Europe

832-255453 - Tettuccio, thermal spa in an Art Nouveau style, colonnade and pool, Montecatini Terme, Tuscany, Italy, Europe

832-175424 - Aerial view, Wehofen, Niederrhein-Therme public pool, sauna, leisure centre, bathing, Marxloh, Duisburg, Ruhrgebiet region, North Rhine-Westphalia, Germany, Europe

832-149245 - Rear entrance of the Friedrichsbad Spa, built by Frederick II, Grand Duke of Baden, 1869-1877, Renaissance Revival style, one atlant on each side, stone architectural supports in the form of men, Roemerplatz 1, Baden-Baden, Baden-Wuerttemberg, Germany, Eu

832-149239 - Detail of the faÁade of the Friedrichsbad spa, built 1869-1877, neo-Renaissance, Roemerplatz 1, Baden-Baden, Baden-Wuerttemberg, Germany, Europe

832-138782 - Detailed view of the Black Pool, West Thumb Geyser Basin, Yellowstone Lake, Yellowstone National Park, Teton County, Wyoming, USA

832-130209 - Blue Lagoon geothermal spa, Iceland, Europe

832-130210 - Blue Lagoon geothermal spa, Iceland, Europe

832-130211 - Blue Lagoon geothermal spa, Iceland, Europe

832-123995 - Turquoise Pool, Midway Geyser Basin, hot springs, Yellowstone National Park, Wyoming, United States of America, USA

832-123920 - Opalescent Pool, geyser, drainage area with coloured thermophilic bacteria, microorganisms, Black Sand Basin, Upper Geyser Basin, Yellowstone National Park, Wyoming, United States of America, USA

832-123922 - Sapphire Pool, geyser, Biscuit Basin, Upper Geyser Basin, Yellowstone National Park, Wyoming, United States of America, USA

832-124063 - Chromatic Pool Geyser, stormy atmosphere, Upper Geyser Basin, geothermal springs in Yellowstone National Park, Wyoming, United States of America, USA

832-124052 - Crested Pool Geyser, Upper Geyser Basin, geothermal springs in Yellowstone National Park, Wyoming, United States of America, USA

832-124049 - Chromatic Pool Geyser, stormy atmosphere, Upper Geyser Basin, geothermal springs in Yellowstone National Park, Wyoming, United States of America, USA

832-124045 - Morning Glory Pool geyser and boardwalk, Upper Geyser Basin, geothermal springs in Yellowstone National Park, Wyoming, United States of America, USA

832-124053 - Crested Pool Geyser, Upper Geyser Basin, geothermal springs in Yellowstone National Park, Wyoming, United States of America, USA

832-124058 - Emerald Pool Geyser, drainage area, colored thermophilic bacteria, microorganisms, geothermal sources, Black Sand Basin, Upper Geyser Basin, Yellowstone National Park, Wyoming, United States of America, USA

832-123928 - Emerald Pool, geyser, drainage area with a boardwalk, coloured thermophilic bacteria, microorganisms, Black Sand Basin, Upper Geyser Basin, Yellowstone National Park, Wyoming, United States of America, USA

832-123926 - Emerald Pool, geyser, drainage area with a boardwalk, coloured thermophilic bacteria, microorganisms, Black Sand Basin, Upper Geyser Basin, Yellowstone National Park, Wyoming, United States of America, USA

832-124064 - Morning Glory Pool Geyser, Upper Geyser Basin, geothermal springs in Yellowstone National Park, Wyoming, United States of America, USA

832-123927 - Emerald Pool, geyser, drainage area with a boardwalk, coloured thermophilic bacteria, microorganisms, Black Sand Basin, Upper Geyser Basin, Yellowstone National Park, Wyoming, United States of America, USA

832-123923 - Drainage area of the Sapphire Pool, geyser, coloured thermophilic bacteria, microorganisms, Biscuit Basin, Upper Geyser Basin, Yellowstone National Park, Wyoming, United States of America, USA

832-110161 - Emerald Pool, geyser, outlet area, colourful thermophilic bacteria, microorganisms, boardwalk, Black Sand Basin, Upper Geyser Basin, Yellowstone National Park, Wyoming, United States of America, USA

832-81117 - Champagne Pool, detailed view of the edge, colour from antimon sulfides, Wai-O-Tapu Thermal Wonderland, Rotorua, North Island, New Zealand

832-81118 - Champagne Pool, edge, coloration through antimony sulfides, Wai-O-Tapu Thermal Wonderland, Roturoa, North Island, New Zealand

832-42373 - Geyser Beauty Pool, thunderstorm clouds at the back, Upper Geyser Basin, geysers, geothermal hot-pools, Yellowstone National Park, Wyoming, USA

832-42374 - Chromatic Pool Geyser, thunderstorm clouds at the back, Upper Geyser Basin, geysers, geothermal hot-pools, Yellowstone National Park, Wyoming, USA

832-44785 - Geothermal pool, Myvatn Nature Bath, Myvatn, Iceland, Europe

1113-75499 - People bathing in a thermal outdoor pool, Alpen Therme Gastein, Bad Hofgastein, Gastein Valley, Salzburg, Austria

1113-66431 - People in thermal bath, People relaxing in thermal bath of Szechenyi-Baths, Pest, Budapest, Hungary

1113-66426 - People at Szechenyi-baths, People relaxing at open-air areo of the Szechenyi-baths, Pest, Budapest, Hungary

1113-66436 - People in open-air swimming pool, People swimming in open-air pool of Szechenyi-Baths, Pest, Budapest, Hungary

1113-66445 - Open-air area of the Gellert Baths, People in the open-air area of the Gellert Baths, Buda, Budapest, Hungary

1113-66427 - People in thermal bath, People relaxing in thermal bath of Szechenyi-Baths, Pest, Budapest, Hungary

1113-66443 - Open-air area of the Gellert Baths, People in the open-air area of the Gellert Baths, Buda, Budapest, Hungary

1113-66446 - Open-air area of the Gellert Baths, People in the open-air area of the Gellert Baths, Buda, Budapest, Hungary

1113-66432 - People in thermal bath, People relaxing in thermal bath of Szechenyi-Baths, Pest, Budapest, Hungary

1113-66428 - People in thermal bath, People relaxing in thermal bath of Szechenyi-Baths, Pest, Budapest, Hungary

737-647 - Outdoor pool with men and women at Szechenyi Thermal Baths, Budapest, Hungary, Europe

737-648 - Outdoor pool with men and women at Szechenyi Thermal Baths, Budapest, Hungary, Europe

1113-25899 - Outdoor pool in Therme Meran, salt water pool and thermal spa, Merano, South Tyrol, Italy

1116-35149 - Japan, Kyushu, Beppu, volcanic pool, spa thermal blood red lake

832-35982 - Geysers, Yellowstone national park, Wyoming, USA

832-35984 - erupting geyser, Yellowstone national park, Wyoming, USA

832-18480 - Outlet with colourful thermophilic bacteria and algae of the Sapphire Pool in Bisquit Basin, Yellowstone National Park, Wyoming, Idaho, Montana, America, United States

832-15929 - Champagne Pool, hot springs, geothermal area Waiotapu, Rotorua, North Island, New Zealand

832-9494 - Detail, Abyss Pool in West Thumb Geyser Basin, Yellowstone National Park, Wyoming, USA

832-9496 - Morning Glory Pool in Upper Geyser Basin, Yellowstone National Park, Wyoming, USA

832-9497 - Morning Glory Pool in Upper Geyser Basin, Yellowstone National Park, Wyoming, USA

832-7050 - Break of dawn at the waterside of Yellowstone Lake, Yellowstone National Park, Wyoming, USA, United States of America

832-7695 - Mud pool in the Namafjall geothermal area at Lake Myvatn in Iceland, Europe

832-375 - A Japanese Macaque, Snow Monkey (Macaca fuscata) in a thermal pool, Joshinetsu Kogen National Park, Japan, Asia

832-11118 - Blahver, blue spring, the most beautiful blue water pool in Hveravellir in the Highlands, in front of Oeskjuholt, a steaming calc-sinter mound which looks like a mini volcano, below a rainbow, Hveravellir, Iceland, Europe

832-11117 - Blahver, blue spring, the most beautiful blue water pool in Hveravellir in the Highlands, in front of Oeskjuholt, a steaming calc-sinter mound which looks like a mini volcano, below a rainbow, Hveravellir, Iceland, Europe

832-11119 - Blahver, blue spring, the most beautiful blue water pool in Hveravellir in the Highlands, in front of Oeskjuholt, a steaming calc-sinter mound which looks like a mini volcano, below a rainbow, Hveravellir, Iceland, Europe

746-9097 - Outdoor thermal pool with hydromassage, Porto Mannu thalassotherapy centre, Palau, Sardegna, Italy

746-9089 - Outdoor thermal pool with hydromassage, Porto Mannu thalassotherapy centre, Palau, Sardegna, Italy

746-9105 - Outdoor thermal pool with hydromassage, Porto Mannu thalassotherapy centre, Palau, Sardegna, Italy