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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.

September 12, 2009 - Steam rising over Midway Geyser Basin geothermal area, Yellowstone Caldera, Yellowstone National Park, Wyoming.

September 12, 2009 - Grand Prismatic Spring, Midway Geyser Basin geothermal area, Yellowstone Caldera, Yellowstone National Park, Wyoming.

A lioness (Panthera leo) with its four week old cubs, Ndutu, Ngorongoro Conservation Area, Serengeti, Tanzania, East Africa, Africa

September 11, 2009 - White Dome Geyser erupting, Lower 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.

November 2007 - Champagne Pool and Artist's Palette, Wai-O-Tapu Geothermal area, Taupo Volcanic Zone, New Zealand.

February 11, 2008 - Dallol geothermal area, 1926 explosion crater by Black Mountain, Danakil Depression, Ethiopia.

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.

An early morning view of snow covered rooftops in San Cassiano near the Alta Badia ski area, Dolomites, South Tyrol, Italy, Europe

Diver enters the cavern system at Chac Mool cenote in the Riviera Maya area of Mexico's Yucatan Peninsula.

Southern elephant seal (Mirounga leonina) pup, called weaners once their mothers stop nursing them, South Georgia Island, Southern Ocean

Burned forest area taken over by young Aspen trees in fall colors east of Greenland Lake, Grand Canyon North Rim, Arizona, United States of America

A row of white yurts illuminated by the Milky Way, stretching across the night sky, Song Kol Lake area, Kyrgyzstan

Inside a traditional house, Luca Ioan and Elena guesthouse, village of Sibiel, department of Sibiu, Transylvania, Romania

Neo-classical buildings preserved, Tap Seac square, Macau, Special Administrative Region, China, Asia

Neo-classical buildings preserved, Tap Seac square, Macau, Special Administrative Region, China, Asia

Neo-classical buildings preserved, Tap Seac square, Macau, Special Administrative Region, China, Asia

Saint Michael cemetery district and Saint Lazarus Church seen from Guia Hill, Macau, Special Administrative Region, China, Asia

The Pueblo La Plata Indian Ruins near Silver Creek Canyon in the Agua Fria National Monument of Arizona. Located north of Black Canyon City

Ancient wall of the Fort Silver Indian Ruins overlooking Silver Creek Canyon in Agua Fria National Monument of Arizona

Road sign along Bloody Basin Road in the Agua Fria National Monument of Arizona directing the way to the Pueblo La Plata Indian Ruins

The primitive Bloody Basin Road winding thru the Agua Fria National Monument north of Black Canyon City Arizona

High Tension Power Lines stretching across Bloody Basin in Agua Fria National Monument north of Black Canyon City Arizona

The Agua Fria River Canyon in the Agua Fria National Monument north of Black Canyon City Arizona, USA

View of colourful buildings and red rooftops at sunset in the Alfama District, Lisbon, Portugal, Europe

View of vintage tram and colourful buildings in the Alfama District on a sunny day, Lisbon, Portugal, Europe

Panoramic view of Lisbon Castle from Miradouro da Senhora do Monte scenic point on a sunny day in the Alfama District, Lisbon, Portugal, Europe

Panoramic view of Lisbon from Miradouro da Senhora do Monte scenic point on a sunny day in the Alfama District, Lisbon, Portugal, Europe

View of Duke of Terceira statue and a modern tram in PC Duque da Terceira on a sunny day, Lisbon, Portugal, Europe

View of Duke of Terceira statue and a modern tram in PC Duque da Terceira on a sunny day, Lisbon, Portugal, Europe

View of colourful architecture and cafes in PC Duque da Terceira on a sunny day, Lisbon, Portugal, Europe

Panoramic views of Santa Cruz de Tenerife is a port city on the island of Tenerife, in Spain���s Canary Islands

Panoramic views of Santa Cruz de Tenerife is a port city on the island of Tenerife, in Spain���s Canary Islands

Woman walking carrying basket on her head, Mono River bank in Grand-Popo area, Benin,Gulf of Guinea,West Africa

Children under a baobab tree, Betammarinbe village in the area around Natitingu, Atakora department, northwestern Benin, Africa

View of shops and stalls and Monument to the Discoveries (Padrao dos Descobrimentos) on a sunny day, Lisbon, Portugal, Europe

Copenhagen, Denmark ��� View of Frue Plads��� entrance to Copenhagen University, framed by bronze busts of scholars, marking the historic core of Denmark���s academic elite since 1479.

Copenhagen, Denmark ��� View of Hv?jbro Plads, a historic square near the canal, known for its equestrian statue of Bishop Absalon and its vibrant role in the city���s cultural and commercial life.

Copenhagen, Denmark ��� Architectural detail of Vor Frelsers Kirke, a baroque-style church known for its corkscrew-shaped spire, offering panoramic views of the city from the top of its tower.