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Volcanic cinder hills in Coconino National Forest, Arizona, USA

The boundary fence between Coconino National Forest and Sunset Crater National Monument of Arizona.

Volcanic cinder hills in Coconino National Forest, Arizona, USA

Volcanic cinder hill in Coconino National Forest, Arizona, USA

East Zion National Park where Highway 9 winds between the Zion-Mount Carmel Tunnel and Checkerboard Mesa, Utah, United States of America

Perito Moreno glacier, Lago Argentino, Argentina.

Aerial view of Mount McKinley, Alaska.

October 16, 2013 - Nighttime eruption of Kliuchevskoi (Klyuchevskoy) Volcano, Kamchatka, Russia. Ash cloud and lava flow are produced by the activity of the snowcovered conical stratovolcano. Column of steam rises where lava flow is melting glacier.

October 16, 2013 - Nighttime eruption of Kliuchevskoi (Klyuchevskoy) Volcano, Kamchatka, Russia. Ash cloud and lava flow are produced by the activity of the snowcovered conical stratovolcano.

October 21, 2013 - Nighttime view of incandescent rockfall of glowing lava down flank of lava dome of Shiveluch Volcano, Kamchatka, Russia.

October 16, 2013 - Eruption of Kliuchevskoi (Klyuchevskoy) Volcano, Kamchatka, Russia. Ash cloud and lava flow are produced by the volcano which is partially shrouded in cloud. Kamen volcano is seen on right.

October 16, 2013 - Nighttime eruption of Kliuchevskoi (Klyuchevskoy) Volcano, Kamchatka, Russia. Ash cloud and lava flow are produced by the activity of the volcano which is partially shrouded in cloud. Kamen volcano is seen on right.

October 21, 2013 - Nighttime moonlit view of incandescent rockfall of glowing lava down flank of lava dome of Shiveluch Volcano, Kamchatka, Russia.

December 3, 2012 - Colourful crater lakes of Kelimutu volcano, Flores Island, Indonesia. Tiwu Nua Muri Koo Fai (Lake of Young Men and Maidens) and Tiwu Ata Polo (Bewitched Lake). The two lakes are highly acidic due to underwater fumarole activity and are turqoise in colour.

January 24, 2012 - Scoria cone on Nyamuragira Volcano, Democratic Republic of Congo.

January 24, 2012 - Yellow sulphurous deposits resulting from degassing coating scoria cone formed during eruption on Nyamuragira Volcano, Democratic Republic of Congo.

February 10, 2008 - Dallol geothermal area, 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.

Iceberg swimming pool, Antarctica.

Volcanic cinder hills in Coconino National Forest, Arizona, USA

Hiker on path along levada (aqueduct) of Green Cauldron (Caldeirao Verde), Madeira island, Atlantic Ocean, Portugal

Nothern lights over Lake Myvatn geothermal area, Iceland.

Path on side of cliff toward Paul do Mar, Madeira island, Atlantic Ocean, Portugal

Hikers along Abra Bay, Sao Lourenco peninsula, Madeira island, Atlantic Ocean, Portugal

Eira do Serrado site above village Curral das Freiras (Nuns valley), Madeira island, Atlantic Ocean, Portugal

Goblin Garden west of Hamilili Point in Petrified Forest National Park, Arizona, United States of America, North America

Bull southern elephant seal (Mirounga leonina) on South Georgia Island, Southern Ocean

Mirador de los 4 Postes, Avila, UNESCO, Castilla y Leon, Spain

Bartolome Island with Pinnacle Rock, a volcanic plug, to the right, a location in the 2003 film Master and Commander, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Adult bull southern elephant seals (Mirounga leonina) fighting for breeding grounds on South Georgia Island, Southern Ocean

Angochagua, Imbabura Province, Ecuador

Landscape in Angochagua Parochia, Imbabura Province, Ecuador

An aerial view of the Song Kol lake area at sunrise, Kyrgyzstan

Highway US89A looking east to Vermilion Cliffs National Monument with Kaibab National Forest boundary sign, Arizona, United States of America

The west entrance of Supai Tunnel on North Kaibab Trail, Grand Canyon North Rim, UNESCO, Arizona, United States of America

The Coconino Overlook along the North Kaibab Trail at Grand Canyon North Rim, UNESCO, Arizona, United States of America

The 11th switchback along the North Kaibab Trail at Grand Canyon North Rim, UNESCO, Arizona, United States of America

The interior of the Supai Tunnel along the North Kaibab Trail, Grand Canyon North Rim, UNESCO, Arizona, United States of America

Tree in autumn, Loch Naver, Sutherland, Highland, Scotland, United Kingdom

River and moorland, Sutherland, Highlands, Scotland, United Kingdom

Suilven, Assynt, Sutherland, Highlands, Scotland, United Kingdom

Looking towards Ben Mor Coigach from Assynt, Sutherland, Highlands, Scotland, United Kingdom

Stac Pollaidh, Assynt, Sutherland, Highlands, Scotland, United Kingdom

Looking towards Ben Mor Coigach from Assynt, Sutherland, Highlands, Scotland, United Kingdom

Stac Pollaidh, Assynt, Sutherland, Highlands, Scotland, United Kingdom

Ardvreck Castle and Stac Pollaidh, Loch Assynt, Ross and Cromarty, Highlands, Scotland, United Kingdom

Dog, Zumbahua, Cotopaxi Province, Ecuador

Inishbofin island, Connemara, County Galway, Connacht, Republic of Ireland

Snow covered landscape, Chino Valley, Arizona, USA

An old gate to the sinkhole called the Keyhole Sink in Williams Arizona within the Kaibab National Forest.

The cliff wall of the Keyhole Sink in the Kaibab National Forest near Williams, Arizona, USA

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

Footpath through Woodland Near Hebden Bridge, United Kingdom

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

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

Look back up the freeway exit ramp for Bloody Basin Road in the Agua Fria National Monument of Arizona, Black Canyon City, USA

A Saguaro covered scenic ridge overlooking the Agua Fria River in the Agua Fria National Monument of Arizona, USA

Path leading to a scenic overlook in the Agua Fria National Monument near the abandoned Richinbar Mine, Arizona, USA

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

Remnants of the Richinbar Mine within the Agua Fria National Monument, Black Canyon City, Arizona, USA

A bicycle parked near the abandoned Richinbar Mine in the Agua Fria National Monument, Arizona, USA

Remnants of the Richinbar Mine within the Agua Fria National Monument, Black Canyon City, Arizona, USA

Open mine shaft at the Richinbar Mine within the Agua Fria National Monument, Black Canyon City, Arizona, USA

An unnamed tributary canyon near the Sunset Point Rest Stop, Arizona, USA

View from Marble Mountain

Santa Cruz de Tenerife is a port city on the island of Tenerife, Canary Islands, Spain

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

Two hikers in high altitude winter valley on the Langtang trek in Kyanjin Gompa, Himalayas, Nepal, Asia

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

Row of houses facing the Rocky beach in Rockcliffe, United Kingdom

Misty landscape of Mount Jianglang, Jiangshan City, Zhejiang Province, China

Gap between two peaks of Mount Jianglang, Jiangshan City, Zhejiang Province, China

Mount Jianglang, Jiangshan City, Zhejiang Province, China

View of vintage Glória Funicular, hilltop tram ride, Lisbon, Portugal, Europe

Trailhead for a sinkhole called the Keyhole Sink in Williams Arizona within the Kaibab National Forest, Arizona, USA

Taking photo of cliffs from Dun Aengus, prehistoric hill fort, Inishmore, largest Aran Island, Galway Bay, County Galway, Connacht, Republic of Ireland