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The Little Teepees on the north side of Haystack Mesa in Petrified Forest National Park, Arizona, United States of America, North America
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.
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 - Castle Geyser eruption with rainbow, 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.
December 23, 2007 - Lava flowing from small tunnel on flank of Pacaya volcano, Guatemala.
December 22, 2007 - Lava flowing from a small lava shield on the flank of Pacaya volcano, Guatemala.
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 - 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.
May 20, 2008 - Lava bomb trajectories visible during nighttime vulcanian eruption of Anak Krakatau volcano, Sunda Strait, Java, Indonesia.
November 13, 2007 - Moeraki Boulders, spherical septarian concretions created by cementation of Paleocene mudstone of the Moeraki formation, Koekohe Beach, New Zealand.
December 12, 2005 - Eruption of ash cloud from Santiaguito dome complex, Santa Maria volcano, Guatemala.
November 2006 - Lava flow during eruption of Mount Etna volcano, Sicily, Italy.
February 11, 2008 - Dallol geothermal area, 1926 explosion crater by Black Mountain, Danakil Depression, Ethiopia.
January 30, 2011 - Lava lake illuminating walls of pit crater at nightfall, Erta Ale volcano, 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 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.
Technical diver in cave system, Mexico.
Diver using side mount gear in cave in Mexico.
Northern lights over Hvitserkur, a spectacular rock formation in Iceland.
Nothern lights over Lake Myvatn geothermal area, Iceland.
Lascar volcano in Chile.
Panoramic view of the Lascar volcano complex in Chile.
East slopes of Haystack Mesa in Petrified Forest National Park, Arizona, United States of America, North America
Slabs of brown sandstone on the summit of Crystal Mesa west of Hamilili Point in Petrified Forest National Park, Arizona, United States of America, North America
The south Haystack Hill in Petrified Forest National Park, Arizona, United States of America, North America
Hoodoo filled cliffs on the north side of Blue Mesa in Petrified Forest National Park, Arizona, United States of America, North America
The east cliffs of Blue Mesa near sunset, Petrified Forest National Park, Arizona, United States of America, North America
View of Anvil Hill and Crystal Butte from the summit of Crystal Mesa west of Hamilili Point in Petrified Forest National Park, Arizona, United States of America, North America
A cliff cave below Crystal Mesa west of Hamilili Point in Petrified Forest National Park, Arizona, United States of America, North America
A rock table sculpted by the wind on Crystal Mesa west of Hamilili Point in Petrified Forest National Park, Arizona, United States of America, North America
View of Crystal Mesa west of Hamilili Point in Petrified Forest National Park, Arizona, United States of America, North America
A dry waterfall west of Hamilili Point in Petrified Forest National Park, Arizona, United States of America, North America
Goblin Garden west of Hamilili Point in Petrified Forest National Park, Arizona, United States of America, North America
Goblin Garden west of Hamilili Point in Petrified Forest National Park, Arizona, United States of America, North America
Goblin Garden west of Hamilili Point in Petrified Forest National Park, Arizona, United States of America, North America
Goblin Garden west of Hamilili Point in Petrified Forest National Park, Arizona, United States of America, North America
Anvil Hill west of Hamilili Point in Petrified Forest National Park, Arizona, United States of America, North America
Gray clay flats below Anvil Hill west of Hamilili Point in Petrified Forest National Park, Arizona, United States of America, North America
A dry waterfall in Crystal Creek below Crystal Mesa west of Hamilili Point in Petrified Forest National Park, Arizona, United States of America, North America
A sloping red sand dune above Hamilili Wash in Petrified Forest National Park, Arizona, United States of America, North America
Waterfall pouring down a rocky cliff, with blurred motion, resulting from a slow shutter speed; at Welcombe Mouth, Hartland, north Devon, England, United Kingdom, Europe
The 12 Bens, Connemara, County Galway, Connacht, Republic of Ireland, Europe
The west entrance of Supai Tunnel on North Kaibab Trail, Grand Canyon North Rim, UNESCO, Arizona, United States of America
The Red Wall of sandstone east of Supai Tunnel on North Kaibab Trail, Grand Canyon North Rim, UNESCO, Arizona, United States of America
The sheer cliff of the Red Wall along the North Kaibab Trail, Grand Canyon North Rim, UNESCO, Arizona, United States of America
View above Red Wall Bridge crossing Roaring Springs Canyon, North Kaibab Trail, Grand Canyon North Rim, UNESCO, Arizona, United States of America
Red Wall Bridge crossing Roaring Springs Canyon on North Kaibab Trail, Grand Canyon North Rim, UNESCO, Arizona, United States of America
Lonely Boulders and exposed rock in Pleasant Valley, Kaibab National Forest just north of Grand Canyon North Rim, 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
Distant view of the Seljalandsfoss waterfall with the ash plume of the Eyjafjallajokull eruption in the distance, near Hella, southern Iceland, Iceland, Polar Regions
Houses at foot of mountains with the ash plume of the Eyjafjallajokull eruption in the distance, southern area, Iceland, Polar Regions
Bird petroglyph, Petrified Forest National Park, Arizona, United States of America, North America
Distant view of the Seljalandsfoss waterfall with the ash plume of the Eyjafjallajokull eruption in the distance, near Hella, southern Iceland, Iceland, Polar Regions
The granite riverbed of the Agua Fria River Canyon in the Agua Fria National Monument of Arizona.
The granite riverbed of the Agua Fria River Canyon in the Agua Fria National Monument of Arizona.
The granite riverbed of the Agua Fria River Canyon in the Agua Fria National Monument of Arizona.
An ephemeral pool of water in the granite riverbed of the Agua Fria River Canyon in the Agua Fria National Monument of Arizona.
Holywell Cave (St. Cuthbert's Cave) on Holywell Beach, Cornwall, England, United Kingdom, Europe
Postojna Caves, Postojna, Slovenia, Eastern Europe
Postojna Caves, Postojna, Slovenia, Eastern Europe
Postojna Caves, Postojna, Slovenia, Eastern Europe
dramatic coastline with rocks of Madeira, Portugal
dramatic coastline with rocks of Madeira, Portugal
The Great Pyramid Archaeological Site, Cholula, Puebla State, Mexico
The Great Pyramid Archaeological Site, Cholula, Puebla State, Mexico
Amazing sunrise on the coast of Madeira
Skala Kitayskaya Stenka National Park, Krasnoyarsk, Siberia, Russia
Ponta de Sv�o Lourenv�o, Madeira
North Coast, Madeira
Monte Alban Archaeological Site, Oaxaca State, Mexico
Patio Hundido, Sunken Courtyard, North Platform, Monte Alban Archaeological Site, Oaxaca State, Mexico
Monte Alban Archaeological Site, Oaxaca State, Mexico
Landscape of Monte Alban, Oaxaca State, Mexico
The Palace, Mitla Archaeological Site, San Pablo Villa de Mitla, Oaxaca State, Mexico
Hierve el Agua pools at sunset, elevated view, San Lorenzo Albarradas, Oaxaca State, Mexico
Petrified Waterfall at sunset, Hierve el Agua, San Lorenzo Albarradas, Oaxaca State, Mexico
Petrified Waterfall at sunset, Hierve el Agua, San Lorenzo Albarradas, Oaxaca State, Mexico
Petrified Waterfall at dusk, Hierve el Agua, San Lorenzo Albarradas, Oaxaca State, Mexico
Petrified Waterfall at dusk, Hierve el Agua, San Lorenzo Albarradas, Oaxaca State, Mexico
Petrified Waterfall at dusk, Hierve el Agua, San Lorenzo Albarradas, Oaxaca State, Mexico
Petrified Waterfall at dusk, Hierve el Agua, San Lorenzo Albarradas, Oaxaca State, Mexico
Petrified Waterfall at dusk, Hierve el Agua, San Lorenzo Albarradas, Oaxaca State, Mexico
Petrified Waterfall at dusk, Hierve el Agua, San Lorenzo Albarradas, Oaxaca State, Mexico
Petrified Waterfall at dusk, elevated view, Hierve el Agua, San Lorenzo Albarradas, Oaxaca State, Mexico
Hot Spring at Hierve el Agua, San Lorenzo Albarradas, Oaxaca State, Mexico
Yesnaby Castle sea stack and cliffs on the wild west coast of Orkney, Scotland, United Kingdom, Europe
Sumidero Canyon, elevated view, Chiapas State, Mexico
Sumidero Canyon, Chiapas State, Mexico
Temple of the Bats, San Gervasio Archaeological Site, Cozumel Island, Quintana Roo State, Mexico