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Water spout from Strokkur Geysir exploding into the sky on a stormy evening, near Reykjavik, Iceland, Polar Regions

Grizzly bear (Ursus arctos horribilis), Yellowstone National Park, Wyoming, United States of America, North America

Grizzly bear (Ursus arctos horribilis), Yellowstone National Park, Wyoming, United States of America, North America

Fortified walls and towers of the Aljaferia palace dating from the 11th century, Saragossa (Zaragoza), Aragon, Spain, Europe

Mosaic of Emperor Ioannes I Comnenos holding a purse, symbolizing donation he made to the church, Hagia Sophia, Istanbul, Turkey, Europe

Barragem do Alqueva dam, part of the multipurpose water management project on the Rio Guadiana river, hydro-electricity generation electricity power lines, Moura, Portugal, Europe

Fortified walls and towers of the Aljaferia Palace dating from the 11th century, Saragossa (Zaragoza), Aragon, Spain, Europe

Temple of the Reclining Buddha (Wat Pho) (Wat Phra Chetuphon), Bangkok, Thailand, Southeast Asia, Asia

Walls and towers at night of the Aljaferia Palace, dating from the 11th century, Saragossa (Zaragoza), Aragon, Spain, Europe

Fortified walls and towers of the Aljaferia palace dating from the 11th century, Saragossa (Zaragoza), Aragon, Spain, Europe

Fortified walls and towers of the Aljaferia palace dating from the 11th century, Saragossa (Zaragoza), Aragon, Spain, Europe

Lion (Panthera leo) showing flehmen grimace, Zimanga private game reserve, KwaZulu-Natal, South Africa, Africa

Grizzly bear (Ursus arctos horribilis), Yellowstone National Park, Wyoming, United States of America, North America

Grizzly bear (Ursus arctos horribilis), Yellowstone National Park, Wyoming, United States of America, North America

Skogarfoss, the powerful curtain waterfall drops 60 m over a cliff of basalt lavas, south coast, Iceland, Polar Regions

Waterfall shot with a slow shutter speed, resulting in blurred motion, at Welcombe Mouth, Hartland, north Devon, England, United Kingdom, Europe

Perito Moreno Glacier, UNESCO World Heritage Site, around El Calafate, Santa Cruz province, Patagonia, Argentina, South America

Horse gathering, Estancia Nibepo Aike on the Argentino lakeshore, around El Calafate, Patagonia, Argentina, South America

A male lion (Panthera leo) feeds on an African elephant (Loxodonta africana), Savuti, Chobe National Park, Botswana, Africa

An African elephant (Loxodonta africana) chases away a lion (Panthera leo) resting along its path, Savuti, Chobe National Park, Botswana, Africa

February 24, 2013 - Mushroom shaped ash cloud produced by powerful explosive eruption of Sakurajima volcano, Kagoshima, Japan.

February 24, 2013 - Powerful explosive eruption of Sakurajima volcano, Japan. Ash cloud rises against blue sky.

February 23, 2013 - Powerful night time explosive eruption of Sakurajima volcano, Japan. Trajectories of glowing incandescent volcanic bombs are visible.

February 23, 2013 - Powerful night time explosive eruption of Sakurajima volcano, Japan. Trajectories of glowing incandescent volcanic bombs are visible. Static lightning discharges are visible at top of picture.

November 26, 2012 - Powerful explosive strombolian type eruption of Batu Tara volcano, Komba Island, Indonesia. Trajectories of red glowing lava bombs are visible.

December 22, 2007 - Lava flowing from a small lava shield on the flank of Pacaya volcano, Guatemala.

December 30, 2007 - Lava is flung high in the air during a nighttime eruption of Fuego volcano, Antigua, Guatemala.

November 2006 - Boulder rolling in lava flow at dusk during eruption of Mount Etna volcano, Sicily, Italy.

The beautiful and little-known Kvernufoss waterfall, taken on a sunny winter day, Iceland, Polar Regions

Adult bald eagle (Haliaeetus leucocephalus) perched in Sitka spruce tree, Southeast Alaska, United States of America

Adult brown bear (Ursus arctos) foraging for salmon at the Brooks River, Katmai National Park, Alaska, United States of America

Adult brown bears (Ursus arctos) foraging for salmon at the Brooks River, Katmai National Park, Alaska, United States of America

Adult male polar bear (Ursus maritimus), on multi-year ice floes off the eastern coast of Spitsbergen in the Svalbard, Norway

Detail of minaret of Koutoubia Mosque, with powerful muezzin speakers, Medina of Marrakesh, UNESCO World Heritage Site, Morocco, North Africa, Africa