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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

Female roads workers spreading hot tar to resurface roads after monsoon damage high in the hills of Arunachal Pradesh, India, Asia

Japanese macaque (Macaca fuscata) (Snow monkey), mother and baby soaking in hot thermal spring pool, Joshin-etsu National Park, Honshu, Japan, Asia

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

Tourists looking at hot springs and sulphur ponds, Dallol, Danakil Depression, Afar Region, Ethiopia, Africa

Palette Spring, Travertine Terraces, Mammoth Hot Springs, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

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

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

Skull rock formation, Joshua Tree National Park, California, United States of America, North America

El Tatio Geysers, at 4300m above sea level El Tatio is the world's highest geyser field, the area is ringed by volcanoes and fed by 64 geysers, Atacama Desert, Norte Grande, Chile, South America

El Tatio Geysers, at 4300m above sea level El Tatio is the world's highest geyser field, the area is ringed by volcanoes and fed by 64 geysers, Atacama Desert, Norte Grande, Chile, South America

Thermopolium (Roman bar for hot food and drink), Ostia Antica archaeological site, Ostia, Rome province, Latium (Lazio), Italy, Europe

Dawn over ancient temples from hot air balloon, Bagan (Pagan), Central Myanmar, Myanmar (Burma), Asia

Hot volcanic steam rising into monsoon clouds from Kawah Ratu (Queen's Crater) of Mount Tangkuban, Perahu, Bandung, Java, Indonesia, Southeast Asia, Asia

Hot volcanic steam rising into monsoon clouds from Kawah Ratu (Queen's Crater) of Mount Tangkuban, Perahu, Bandung, Java, Indonesia, Southeast Asia, Asia

The interior soldado of Isla Espiritu Santo, Baja California Sur, Sea of Cortez, Mexico, North America

April 1, 2012 - Nighttime paroxysmal eruption at Mount Etna Volcano, Italy. Steam cloud rising as lava melts snow in Valle del Bove.

January 24, 2012 - Lava in crater glowing during blue hour on Nyamuragira Volcano, Kimanura Eruption.

January 22, 2012 - Glowing lava in crater illuminating gas cloud above Nyamuragira Volcano, Kimanura Eruption.

January 22, 2012 - Bush silhouetted against glow of lava in crater of Nyamuragira Volcano, Kimanura Eruption.

January 24, 2012 - Incandescent lava bombs expelled during a basaltic fissure eruption on Nyamuragira Volcano, Kimanura Eruption.

January 23, 2012 - Incandescent lava bombs expelled during a basaltic fissure eruption on Nyamuragira Volcano, Kimanura Eruption.

September 12, 2009 - Chromatic Pool Hot Spring, Upper Geyser Basin geothermal area, Yellowstone Caldera, Yellowstone National Park, Wyoming.

September 12, 2009 - Morning Glory Pool Hot Spring, Upper Geyser Basin geothermal area, Yellowstone Caldera, Yellowstone National Park, Wyoming.

September 12, 2009 - Morning Glory Pool Hot Spring, Upper Geyser Basin geothermal area, Yellowstone Caldera, Yellowstone National Park, Wyoming.

September 12, 2009 - Morning Glory Pool Hot Spring, Upper Geyser Basin geothermal area, Yellowstone Caldera, Yellowstone National Park, Wyoming.

September 12, 2009 - Chromatic Pool Hot Spring, Upper Geyser Basin geothermal area, Yellowstone Caldera, Yellowstone National Park, Wyoming.

November 2007 - Champagne Pool hot spring, Wai-O-Tapu Geothermal area, Taupo Volcanic Zone, New Zealand.

November 2007 - Orange coloration in Champagne Pool hot spring, Wai-O-Tapu Geothermal area, Taupo Volcanic Zone, New Zealand.

November 2007 - Bubbles rising in Champagne Pool hot spring, Wai-O-Tapu Geothermal area, Taupo Volcanic Zone, New Zealand.

January 22, 2011 - Lava Lake with small lava fountains, Nyiragongo Volcano, Democratic Republic of the Congo.

January 21, 2011 - Small fountains in lava lake, Nyiragongo Volcano, Democratic Republic of the Congo.

January 21, 2011 - Active lava lake in pit crater, Nyiragongo Volcano, Democratic Republic of the Congo.

January 21, 2011 - Lava rafts floating on lava lake in summit caldera, Nyiragongo Volcano, Democratic Republic of the Congo.

January 21, 2011 - Nighttime view of summit caldera with lava lake, Nyiragongo Volcano, Democratic Republic Congo.

January 21, 2011 - Nighttime view of lava lake in pit crater, Nyiragongo Volcano, Democratic Republic of the Congo.

January 21, 2011 - Nighttime view of lava lake in pit crater, Nyiragongo Volcano, Democratic Republic of the Congo.

May 21, 2008 - Lava bomb trajectories visible during nighttime vulcanian eruption of Anak Krakatau volcano, Sunda Strait, Java, Indonesia.

May 20, 2008 - Lava bomb trajectories visible during nighttime vulcanian eruption of Anak Krakatau volcano, Sunda Strait, Java, Indonesia.

May 20, 2008 - Lava bomb trajectories visible during nighttime vulcanian eruption of Anak Krakatau volcano, Sunda Strait, Java, Indonesia.

February 11, 2008 - Dallol geothermal area, egg-shaped fumarole deposits formed in salt deposits of brine hot springs, Danakil Depression, Ethiopia.

January 27, 2011 - Dallol geothermal area, potassium salt deposits formed by brine hot springs, Danakil Depression, Ethiopia.

January 27, 2011 - Dallol geothermal area, potassium salt deposits formed by brine hot springs, Danakil Depression, Ethiopia.

January 27, 2011 - Dallol geothermal area, potassium salt deposits formed by brine hot springs, Danakil Depression, Ethiopia.

January 27, 2011 - Dallol geothermal area, potassium salt deposits formed by brine hot springs, Danakil Depression, Ethiopia.

January 27, 2011 - Dallol geothermal area, potassium salt deposits formed by brine hot springs, Danakil Depression, Ethiopia.

January 27, 2011 - Dallol geothermal area, terraces, potassium salt deposits formed by brine hot springs, Danakil Depression, Ethiopia.

January 27, 2011 - Dallol geothermal area, terraces of potassium salt deposits formed by brine hot springs, Danakil Depression, Ethiopia.

January 27, 2011 - Dallol geothermal area, potassium salt deposits formed by brine hot springs, Danakil Depression, Ethiopia.

January 27, 2011 - Dallol geothermal area, potassium salt deposits formed by brine hot springs, Danakil Depression, Ethiopia.

View of hot air balloons and reflections in the Nile River at dawn at Al Daba 'Eya near Luxor, Luxor, Egypt, Africa

Shattered pieces of petrified wood in a sandy wash in the Jasper Forest of Petrified Forest National Park, Arizona, United States of America, North America

A Hoodoo of expansive clay called Bentonite in the Jasper Forest of Petrified Forest National Park, Arizona, United States of America, North America

Shattered pieces of petrified wood in a sandy wash in the Jasper Forest of Petrified Forest National Park, Arizona, United States of America, North America

View of hot food stall in Dotonbori, vibrant entertainment district near the river, Osaka, Honshu, Japan

Large pieces of petrified wood in the Jasper Forest of Petrified Forest National Park, Arizona, United States of America, North America

View of hot food restaurant near Tsutenkaku Tower at dusk in the Shinsekai area, Osaka, Honshu, Japan