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Aerial view of Mount Visoke (Mount Bisoke), an extinct volcano, straddling border of Rwanda and the Democratic Republic of the Congo. with Mount Mikeno in background, Virunga Volcanoes, Great Rift Valley, Africa

Aerial view of Mount Sabyinyo, an extinct volcano and oldest of the Virunga Mountains, the summit at 3645ï¾ metres marks the intersection of the borders of Democratic Republic of the Congo (DRC), Rwanda, and Uganda, Virunga Volcanoes, Africa

Aerial view of Mount Visoke (Mount Bisoke), an extinct volcano straddling the border of Rwanda and Democratic Republic of the Congo (DRC) showing crater lake, with Mount Mikeno in background, Virunga Volcanoes, Great Rift Valley, Africa

Malpais badlands volcanic landscape looking northeast from Los Hervideros, Parque Natural Los Volcanes, near Yaiza, Lanzarote, Canary islands, Spain, Atlantic, Europe

Volcanic landscape of solidified lava flows and distant cone volcanoes, near Yaiza, Lanzarote, Canary Islands, Spain, Atlantic, Europe

Desert road stretching into the distance with rocky mountains under a clear blue sky in Tenerife, Canary Islands, Spain, Atlantic, Europe

The Blue Lake, a natural reservoir and one of three crater lakes at the top of Mt Gambier, an extinct volcano and town in the south east of the state, South Australia, Australia

Lago Quilotoa, caldera lake in extinct volcano in central highlands of Andes, Ecuador, South America

Dramatic view of mountains, extinct volcanos and glaciers, from Dyrholaey, near Vik Y Myrdal, South Iceland, Polar Regions

A view of the small bay and the extinct volcano on the south side of Isla Coronado, Baja California Sur, Sea of Cortez, Mexico, North America

Mount Edgecumbe reflections, extinct volcano, Kruzof island, from Sitka Sound, Sitka, Northern Panhandle, Southeast Alaska, United States of America, North America

Sea otters (Enhyrda lutris), endangered species, and Mount Edgecumbe, extinct volcano, Sitka Sound, Sitka, Southeast Alaska, United States of America, North America

The Temple of Mount Popa, the core of an extinct volcano and abode of Myanmar's most powerful nats (gods), Mount Popa, Myanmar (Burma), Asia

The Temple of Mount Popa, the core of an extinct volcano and abode of Myanmar's most powerful nats (gods), Mount Popa, Myanmar (Burma), Asia

Waikiki, Oahu Island, 760ft Diamond Head, an extinct volcano and popular hike and viewpoint over Waikiki, the famous beach suburb, Hawaii, USAUSA. HAWAII

Crater of extinct volcano, Charco de los Clicos, salt water, green colour through phytoplancton, El Golfo, UNESCO Biosphere Reserve, Lanzarote, Canary Islands, Spain, Europe

Fishing boats, fishing port, village and volcano, La Restinga, El Hierro, Canary Islands, Atlantic Ocean, Spain

Pico Bejenado (1857m), peak of the extinct volcano crater Caldera de Taburiente and beach, Puerto de Tazacorte, UNESCO Biosphere Reserve, Atlantic ocean, La Palma, Canary Islands, Spain, Europe

Pico Bejenado (1857m), peak of the extinct volcano crater Caldera de Taburiente and coast at dusk, Puerto de Tazacorte, UNESCO Biosphere Reserve, Atlantic ocean, La Palma, Canary Islands, Spain, Europe

Pico Bejenado (1857m), peak of the extinct volcano crater Caldera de Taburiente and beach with paraglider, Puerto de Tazacorte, NESCO Biosphere Reserve, Atlantic ocean, La Palma, Canary Islands, Spain, Europe

Pico Bejenado (1857m), peak of the extinct volcano crater Caldera de Taburiente and beach, Puerto de Tazacorte, UNESCO Biosphere Reserve, Atlantic ocean, La Palma, Canary Islands, Spain, Europe

Man walking through a water channel and tunnel, moss, Galeria de agua, Fuentes Marcos y Cordero, natural preserve, Parque Natural de las Nieves, east side of extinct volcanic crater, Caldera de Taburiente, above San Andres, UNESCO Biosphere Reserve, La Palma, Canary Islands, Spain, Europe

The extinct volcano Montana Oliva behind the historical building Casa de Los Coroneles, La Oliva, Fuerteventura, Canary Islands, Spain, Europe

Family hiking through a water channel, moss, Galeria de agua, Fuentes Marcos y Cordero, natural preserve, Parque Natural de las Nieves, east side of extinct volcanic crater, Caldera de Taburiente, above San Andres, UNESCO Biosphere Reserve, La Palma, Canary Islands, Spain, Europe

Pico Bejenado (1857m), peak of the extinct volcano crater Caldera de Taburiente and beach, Puerto de Tazacorte, UNESCO Biosphere Reserve, Atlantic ocean, La Palma, Canary Islands, Spain, Europe

Pico Bejenado (1857m), peak of the extinct volcano crater Caldera de Taburiente and coast at dusk, Puerto de Tazacorte, UNESCO Biosphere Reserve, Atlantic ocean, La Palma, Canary Islands, Spain, Europe

Flower meadow in Spring, Caldera Colorada, extinct volcano, La Florida, village near Masdache, UNESCO Biosphere Reserve, Lanzarote, Canary Islands, Spain, Europe

Submillimeter Array, SMA, consisting of eight radio telescopes at a height of 4080m near the summit of the extinct volcano Mauna Kea, Hawaii, USA

Submillimeter Array, SMA, consisting of eight radio telescopes at a height of 4080m near the summit of the extinct volcano Mauna Kea, Hawaii, USA

Domes of the Subaru Telescope and the two Keck Telescopes near the summit of the extinct volcano Mauna Kea, Hawaii, USA

Trail from the west towards the fortress ruins of Hohentwiel, an extinct volcano in the Hegau region, district of Konstanz, Baden-Wuerttemberg, Germany, Europe

View over the town of Singen on Hohentwiel, an extinct volcano, district of Konstanz, Baden-Wuerttemberg, Germany, Europe

Dry grass in a nature reserve on the western slope of Hohentwiel, an extinct volcano, district of Konstanz, Baden-Wuerttemberg, Germany, Europe

Stone circle inside the extinct volcano of Monte del Cuevo, Parque Natural de los Volcanos, Lanzarote, Canary Islands, Spain, Europe

Panoramic view into the Hegau from the western slope of Hohentwiel, an extinct volcano in the Hegau region, district of Konstanz, Baden-Wuerttemberg, Germany, Europe

Panoramic view towards the fortress ruins of Hohentwiel, an extinct volcano in the Hegau region, district of Konstanz, Baden-Wuerttemberg, Germany, Europe

Evening light mood on Hohentwiel, an extinct volcano in the Hegau region, district of Konstanz, Baden-Wuerttemberg, Germany, Europe

Scenic view overlooking Monte Brasil and the capital city of Angra do Heroismo, with the sunset reflecting warm light on the whitewashed buildings and the brilliant blue Atlantic Ocean; Terceira, Azores