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Active Gunung Bromo volcano at night, Bromo-Tengger-Semeru National Park, Java, Indonesia, Southeast Asia, Asia

A vintage steam train in a restoration yard with the dome of the former Parliament Building in the background, Havana, Cuba, West Indies, Caribbean, Central 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

The Jacobite steam train on the Glenfinnan Viadust on the Fort William to Mallaig Railway, Highlands, Scotland, United Kingdom, Europe

Snowdon Mountain Railway train and the Llanberis path, Snowdon, Snowdonia National Park, Gwynedd, Wales; United Kingdom, Europe

Geologists taking mineral samples on Gran Cratere (The Great Crater), Vulcano Island, Aeolian Islands, UNESCO World Heritage Site, Sicily, Italy, Mediterranean, Europe

The very active lava lake of Mount Nyiragongo, Virunga National Park, UNESCO World Heritage Site, Democratic Republic of the Congo, Africa

Old Steam Sugar Locomotives, Cienfuegos City, UNESCO World Heritage Site, Cienfuegos, Cuba, West Indies, Central America

A steam locomotive at Darnholme on the North Yorkshire Railway line travelling from Whitby to Pickering, Yorkshire, England, United Kingdom, Europe

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

Glenfinnan Railway Viaduct, part of the West Highland Line, Glenfinnan, Loch Shiel, Highlands, Scotland, United Kingdom, Europe

A wintery scene of the Glenfinnan Railway Viaduct with steam locomotive, Highlands, Scotland, United Kingdom, Europe

Old Patagonian Express La Trochita, steam train, Chubut Province, Patagonia, Argentina, South America

Old Patagonian Express La Trochita, steam train, Esquel Train Station, Chubut Province, Patagonia, Argentina, South America

Old Patagonian Express La Trochita, steam train, Esquel Train Station, Chubut Province, Patagonia, Argentina, South America

Old Patagonian Express La Trochita, steam train, Chubut Province, Patagonia, Argentina, South America

The Champagne pool, Wai-o-tapu Thermal Wonderland, geothermal area, Waiotapu, Rotorua, North Island, New Zealand, Pacific

The Champagne Pool, Wai-o-tapu Thermal Wonderland, geothermal area, Waiotapu, Rotorua, North Island, New Zealand, Pacific

Pilgrims queuing to bathe in the sacred Tampaksiring Spring, Pura Tirta Empul Temple, Ubud, Bali, Indonesia, Southeast Asia, Asia

Worker loaded with big pieces of sulphur in front of steam clouds on the Ijen crater lake, Java, Indonesia, Southeast Asia, Asia

Lone Star Geyser erupts and creates rainbow, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

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

Food being cooked on volcanic grill at visitor centre, Parque Nacional de Timanfaya, national park, Lanzarote, Canary Islands, Atlantic, Europe

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

Hverarondor Hverir mud pots, steam vents, and sulphur deposits on the north coast of Iceland, Polar Regions

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

Mudpots at Namaskard geothermal area (Namafjall-Hverarond), near Lake Myvatn and Reykjahlid, North Iceland, Iceland, Polar Regions

Toxic sulphur fumes escaping from the ceramic pipes at Kawah Ijen, Java, Indonesia, Southeast Asia, Asia

Active Gunung Bromo volcano at night, Bromo-Tengger-Semeru National Park, Java, Indonesia, Southeast Asia, Asia

Hverarondor Hverir mud pots, steam vents, and sulphur deposits on the north coast of Iceland, Polar Regions

Visitors watching mud being ejected from the caldera floor of an active andesite stratovolcano on White Island, North Island, New Zealand, Pacific

Tourists at the Champagne Pool, hot springs, Waiotapu Goethermal Wonderland, Rotorua, New Zealand, Oceania

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

Grand Prismatic Spring, Midway Geyser Basin, 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

Tourists gather to watch Strokker geyser (geysir), an erupting spring at Haukadalur, Iceland, Polar Regions

Mud Volcano Area, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Steam vent at Namaskard geothermal area (Namafjall-Hverarond), Mount Burfell, 935m, behind, near Lake Myvatn and Reykjahlid, North Iceland, Iceland, Polar Regions

Boiling mud pool, Namafjall geothermal area, near Lake Myvatn, northeast area, Iceland, Polar Regions

Mud being ejected from the caldera floor of an active andesite stratovolcano on White Island, North Island, New Zealand, Pacific

Visitors to an active andesite stratovolcano on White Island, off the East side of North Island, New Zealand, Pacific

Geologists taking mineral samples on Gran Cratere (The Great Crater), Vulcano Island, Aeolian Islands, UNESCO World Heritage Site, Sicily, Italy, Mediterranean, Europe

Kinkakuji Temple (Golden Pavilion), UNESCO World Heritage Site, Kyoto, Kansai (Western Province), Honshu, Japan, Asia

Svartsengi (Blue Lagoon) Geothermal Power Station at sunset, Grindavik, Reykjanes Peninsula, Iceland, Polar Regions

Old Dinah, a 1894 steam tractor in Furnace Creek, Death Valley National Park, California, United States of America, North America

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

Rainbow cast by eruption of Riverside Geyser, Firehole River, 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

Tourists watching geyser erupting, Strokkur (the Churn) erupts every 5-10 minutes to heights of up to 20 meters (70ft), Geysir, Golden Circle, Iceland, Polar Regions

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

Mud being ejected from the caldera floor of an active andesite stratovolcano on White Island, North Island, New Zealand, Pacific