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September 12, 2009 - Sawmill Geyser, 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 - 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.
September 11, 2009 - White Dome Geyser erupting, Lower Geyser Basin geothermal area, Yellowstone Caldera, Yellowstone National Park, Wyoming.
November 2007 - Aerial view of crater lake in Tongariro volcanic complex, New Zealand.
November 2007 - Snow-covered Ngauruhoe cone, Mount Tongariro volcano, New Zealand.
November 2007 - Aerial view of 1886 basaltic plinian eruption fissure in rhyolite dome complex, Mount Tarawera volcano, New Zealand.
November 2007 - Aerial view of 1886 basaltic plinian eruption fissure in rhyolite dome complex, Mount Tarawera volcano, New Zealand.
November 2007 - Aerial view of White Island (Whakaari) volcano with central acidic crater lake, Bay of Plenty, New Zealand.
January 22, 2011 - Lava Lake in bottom of summit caldera, Nyiragongo Volcano, Democratic Republic of the Congo.
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 - Active lava lake in pit crater, 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.
January 21, 2011 - Nighttime view of lava lake in pit crater, Nyiragongo Volcano, Democratic Republic of the Congo.
January 21, 2011 - Nighttime view of lava lake in pit crater, Nyiragongo Volcano, Democratic Republic of the Congo.
May 21, 2008 - Lava bomb trajectories visible during nighttime vulcanian eruption of Anak Krakatau volcano, Sunda Strait, Java, Indonesia.
May 20, 2008 - Lava bomb trajectories visible during nighttime vulcanian eruption of Anak Krakatau volcano, Sunda Strait, Java, Indonesia.
May 20, 2008 - Lava bomb trajectories visible during nighttime vulcanian eruption of Anak Krakatau volcano, Sunda Strait, Java, Indonesia.
December 12, 2005 - Eruption of ash cloud from Santiaguito dome complex, Santa Maria volcano, Guatemala.
January 30, 2011 - Lava lake illuminating walls of pit crater at nightfall, Erta Ale volcano, Danakil Depression, Ethiopia.
January 30, 2011 - Lava lake illuminating walls of pit crater at nightfall, Erta Ale volcano, Danakil Depression, Ethiopia.
Arid soil on edge of the smoky Erta Ale volcano from above, Danakil Depression, Afar Region, Ethiopia, Africa
Smoke over the two craters of Erta Ale volcano summit caldera, Danakil Depression, Afar Region, Ethiopia, Africa
Panoramic aerial view of the active Erta Ale volcano caldera, Danakil Depression, Afar Region, Ethiopia, Africa
Panoramic aerial view of sunset over the active Erta Ale volcano crater, Danakil Depression, Afar Region, Ethiopia, Africa
Aerial view of stone huts on top of majestic Erta Ale volcano, Danakil Depression, Afar Region, Ethiopia, Africa
Afar man looking down to Erta Ale volcano caldera, Danakil Depression, Afar Region, Ethiopia, Africa
Smoke emission out of Erta Ale volcano caldera, Danakil Depression, Afar Region, Ethiopia, Africa
Lobos Island, a nature reserve and La Caldera volcano, just north of this resort, Corralejo, Fuerteventura, Canary Islands, Spain, Atlantic, Europe
Lava lake in the caldera of the Ambrym volcano, Vanuatu, Pacific
Smoking Ambrym volcano, Vanuatu, Pacific
Smoking Ambrym volcano, Vanuatu, Pacific
Sunset over the white stone buildings and windmills of Oia on the tip of Santorini's caldera, Santorini, Cyclades, Greek Islands, Greece, Europe
Ammoudi Bay (Amoudi) at the bottom of the steps below Oia, Santorini, Cyclades, Greek Islands, Greece, Europe
Long exposure sunset view over the whitewashed buildings and windmills of Oia, Santorini, Cyclades, Greek Islands, Greece, Europe
Day time view over the whitewashed buildings and windmill of Oia from the castle walls, Santorini, Cyclades, Greek Islands, Greece, Europe
White washed stone buildings and the blue cupolas of a church in Oia, Santorini, Cyclades, Greek Islands, Greece, Europe
View of Caldera in Santorini, Cyclades, Aegean Islands, Greek Islands, Greece, Europe
Sunrise shot of the Church in Imerovigli, looking over to Fira and the Caldera of Santorini, Santorini, Cyclades, Aegean Islands, Greek Islands, Greece, Europe
Whitewashed houses on the caldera at sunset, Fira, Santorini, Cyclades, Greek Islands, Greece, Europe
Santorini, stairs with a view to the sea and Caldera, Santorini, Cyclades, Greek Islands, Greece, Europe
Wall of the Minoan caldera, with town of Thira (Fir) perched on rim, Santorini, Cyclades, Greek Islands, Greece, Europe
Oia village on rim of volcanic caldera, Santorini, Thira, Cyclades, Greek Islands, Greece, Europe
Aerial view of a healthy fringing reef along the edge of Komodo Island in Komodo National Park, Indonesia. This tropical area in the Lesser Sunda Islands is known for its marine biodiversity as well as its infamous Komodo dragons.
A bird's eye view of an idyllic island and healthy fringing reef in Komodo National Park, Indonesia. This tropical area in the Lesser Sunda Islands is known for its marine biodiversity as well as its infamous Komodo dragons.
Caldera de Taburiente National Park, UNESCO Biosphere Site, La Palma, Canary Islands, Spain, Atlantic, Europe
Aerial view of the idyllic island of Gili Banta just outside of Komodo National Park, Indonesia. This tropical area in the Lesser Sunda Islands is known for its marine biodiversity as well as its infamous Komodo dragons.
A bird's eye view shows the rugged landscape of Komodo Island in Komodo National Park, Indonesia. This tropical area in the Lesser Sunda Islands is known for its marine biodiversity as well as its infamous Komodo dragons.
Gentoo penguin (Pygoscelis papua) hauled out in Port Foster, inside the caldera at Deception Island, Antarctica, Polar Regions
Gentoo penguins (Pygoscelis papua) hauled out in Port Foster, inside the caldera at Deception Island, Antarctica, Polar Regions
The Caldera de Gairia volcanic cone looms over this town in the central south, Tiscamanita, Fuerteventura, Canary Islands, Spain, Europe
Volcanic landscape of the Masaya caldera, Nicaragua's first national park, with craters and a'a blocky lava, Masaya, Nicaragua, Central America
Smoking Ambrym volcano, Vanuatu, Pacific
Volcanic cinder cones in Cinque Picos caldera, seen from Serra do Cume, Terceira island, Azores, Portugal, Atlantic, Europe
Church of Agios Minas at dawn, Fira, Santorini (Thira) Island, Cyclades, Greek Islands, Greece, Europe
Aerial view of Caldera Colorada at sunset, Tinajo, Las Palmas, Lanzarote, Canary Islands, Spain, Atlantic, Europe
Aerial view of Caldera Colorada, Tinajo, Las Palmas, Lanzarote, Canary Islands, Spain, Atlantic, Europe
Imerovigli and Skaros Rock, on the cliffs overlooking the caldera, Santorini, the Cyclades, Aegean Sea, Greek Islands, Greece, Europe
Windmills, houses and hotels in the town of Oia, on the clifftop overlooking the caldera, Santorini, The Cyclades, Aegean Sea, Greek Islands, Greece, Europe
Smoke emission out of Erta Ale volcano caldera, Danakil Depression, Afar Region, Ethiopia, Africa
The view from Oia castle along Santorini's caldera during the evening blue hour with the buildings lit, Santorini, Cyclades, Greek Islands, Greece, Europe
Caldera at foggy sunrise seen from Fira, Santorini (Thira) Island, Cyclades, Greek Islands, Greece, Europe
Nisyros volcano, Nisyros Island, Dodecanese Islands, Greek Islands, Greece, Europe
Sunset view over the whitewashed buildings and windmills of Oia, Santorini, Cyclades, Greek Islands, Greece, Europe
Aerial view of Caldera Colorada at sunset, Tinajo, Las Palmas, Lanzarote, Canary Islands, Spain, Atlantic, Europe
Los Roques de Garcia at Caldera de las Canadas, Pico de Teide at sunset, National Park Teide, UNESCO World Heritage Natural Site, Tenerife, Canary Islands, Spain, Europe
Pink panoramic sunrise from the top of Batur volcano, Bali, Indonesia, Southeast Asia, Asia
Caldera de Taburiente National Park, UNESCO Biosphere Site, La Palma, Canary Islands, Spain, Atlantic, Europe
Aerial view of Caldera Colorada at sunset, Tinajo, Las Palmas, Lanzarote, Canary Islands, Spain, Atlantic, Europe
Caldera de Taburiente National Park, UNESCO Biosphere Site, La Palma, Canary Islands, Spain, Atlantic, Europe
Caldera de Taburiente National Park, UNESCO Biosphere Site, La Palma, Canary Islands, Spain, Atlantic, Europe
Panoramic of sunset over the fumarole of Erta Ale volcano, Danakil Depression, Afar Region, Ethiopia, Africa
Caldera de Taburiente National Park, UNESCO Biosphere Site, La Palma, Canary Islands, Spain, Atlantic, Europe
View over Parque Nacional de la Caldera de Taburiente from Roque de los Muchachos, La Palma, Canary Islands, Spain, Europe
Panoramic of Erta Ale volcano at sunset, Danakil Depression, Afar Region, Ethiopia, Africa
Bell Tower of Orthodox Church overlooking the Caldera in Fira, Santorini (Thira), Cyclades Islands, Aegean Sea, Greek Islands, Greece, Europe
Day time view over the whitewashed buildings and windmill of Oia from the castle walls, Santorini, Cyclades, Greek Islands, Greece, Europe
A church roof and bell with the white washed stone walls and blue church cupolas of Oia, Santorini, Cyclades, Greek Islands, Greece, Europe
Lake Quilotoa at sunset, Cotopaxi Province, Ecuador, South America
Caldera Blanca, Lanzarote, Canary Islands, Spain, Atlantic, Europe
Lake Guatavita, Colombian Andes, Colombia, South America
Caldera and Fira City, Santorini (Thira) Island, Cyclades, Greek Islands, Greece, Europe
Cruise Ship at the caldera seen from Fira, Santorini (Thira) Island, Cyclades, Greek Islands, Greece, Europe
Barren 'moonscape' landscape near Roque de los Muchachos, Parque Nacional de la Caldera de Taburiente, La Palma, Canary Islands, Spain, Europe
Fira on the cliffs overlooking the caldera, from Imerovigli, Santorini, the Cyclades, Aegean Sea, Greek Islands, Greece, Europe
Observatory on Roque de los Muchachos at sunset, Parque Nacional de la Caldera de Taburiente, UNESCO Biosphere Reserve, La Palma, Canary Islands, Spain, Europe
Sunset over the white stone buildings and windmills of Oia on the tip of Santorini's caldera, Santorini, Cyclades, Greek Islands, Greece, Europe
Sunset view over the whitewashed buildings and windmills of Oia from the castle walls, Santorini, Cyclades, Greek Islands, Greece, Europe
View from Roque de los Muchachos into Caldera de Taburiente at sunset, Parque Nacional de la Caldera de Taburiente, UNESCO Biosphere Reserve, La Palma, Canary Islands, Spain, Europe
Hiker on a hiking path from Los Brecitos through Caldera de Taburiente, Parque Nacional de la Caldera de Taburiente, UNESCO Biosphere Reserve, La Palma, Canary Islands, Spain, Europe
Caldera de Taburiente National Park, UNESCO Biosphere Site, La Palma, Canary Islands, Spain, Atlantic, Europe
Lake Quilotoa, Cotopaxi Province, Ecuador, South America
Lake Quilotoa, Cotopaxi Province, Ecuador, South America