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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

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

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

Walls and towers at night 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

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

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

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

A humpback whale, Megaptera novaeangliae, raises its powerful fluke out of the blue waters of the Caribbean Sea and slams it down on the surface to communicate.

A humpback whale, Megaptera novaeangliae, raises its powerful fluke out of the blue waters of the Caribbean Sea and slams it down on the surface to communicate.

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

Adult female killer whale (Orcinus orca) surfacing in Chatham Strait, Southeast Alaska, United States of America, Pacific Ocean, North America

Guadalupe fur seal (Arctocephalus townsendi), at new haul out on Las Animas Island, Baja California Sur, Sea of Cortez, Mexico, North America

Exterior view of massive sculptures at the Temple of Hathor, Abu Simbel Temple next to Lake Nasser, Temple of the Pharaohs, Ramses II, Nubia, Egypt, Africa

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

Two male lions (Panthera leo) feed on an African elephant (Loxodonta africana), Savuti, Chobe National Park, Botswana, Africa

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

Sunrise over Callanish (Calanais) Standing Stones, the Neolithic monument in Callanish, Isle of Lewis, Outer Hebrides, Scotland, United Kingdom, Europe

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.