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Landscape and clouds near Roque de los Muchachos, Parque Nacional de la Caldera de Taburiente, La Palma, Canary Islands, Spain, Europe

Landscape near Roque de los Muchachos, Parque Nacional de la Caldera de Taburiente, La Palma, Canary Islands, Spain, Europe

Sunset over the caldera, typical church in fore, Firostefani, Santorini (Thira) (Thera), Cyclades Islands, South Aegean, Greek Islands, Greece, Europe

Illuminated cruise ship entering the caldera at dawn, Oia (Ia), Santorini (Thira) (Thera), Cyclades Islands, South Aegean, Greek Islands, Greece, Europe,

Sunset over the caldera, typical church in foreground, Firostefani, Santorini (Thira) (Thera), Cyclades Islands, South Aegean, Greek Islands, Greece, Europe

View of Parc Nacional de la Caldera de Taburiente from Roque de los Muchachos, La Palma, Canary Islands, Spain, Atlantic, Europe

Sulphur crystals on fumarole at Papandayan Volcano an active four crater caldera, Garut, West Java, Java, Indonesia, Southeast Asia, Asia

Sulphur encrusted fumaroles at Papandayan Volcano, an active four crater caldera, Garut, West Java, Java, Indonesia, Southeast Asia, Asia

Sulphur encrusted fumarole at Papandayan Volcano, an active four crater caldera, Garut, West Java, Java, Indonesia, Southeast Asia, Asia

Green crater lake and steaming fumaroles at Papandayan Volcano, an active four cratered caldera, Garut, West Java, Java, Indonesia, Southeast Asia, Asia

Mineral stained pond on collapsed flank of Papandayan Volcano, an active four crater caldera, Garut, West Java, Java, Indonesia, Southeast Asia, Asia

Rock formations against a clear blue sky with mountains in the background, showcasing natural erosion and geological features in the Teide National Park,UNESCO World Heritage Site, Tenerife, Canary Islands, Spain, Atlantic, Europe

Majestic night sky with Milky Way over a serene mountain landscape in the Teide National Park, UNESCO World Heritage Site, Tenerife, Canary Islands, Spain, Atlantic, Europe

Bell Tower of Orthodox Church overlooking the Caldera in Fira, Santorini (Thira), Cyclades Islands, Aegean Sea, Greek Islands, Greece, Europe

Russian research ship Akademik Ioffe moored in the flooded volcanic caldera of Deception Island, South Shetland Islands, Antarctic Peninsula, Antarctica, Polar Regions

Tourists crossing the mountains that rim the volcanic caldera of Deception Island, South Shetland Islands, Antarctic Peninsula, Antarctica, Polar Regions

Aerial view of Telescope observatory, near Caldera de Taburiente National Park, UNESCO Biosphere Site, La Palma, Canary Islands, Spain, Atlantic, Europe

Aerial view of Telescope observatory, near Caldera de Taburiente National Park, UNESCO Biosphere Site, La Palma, Canary Islands, Spain, Atlantic, Europe

Kayaks at Quilotoa, a water-filled caldera and the most western volcano in the Ecuadorian Andes, Ecuador, South America

Volcanic landscape with rocky terrain in the foreground and a clear blue sky over the ocean in the background in Tenerife, Canary Islands, Spain, Atlantic, Europe

Malpais badlands volcanic landscape Montana Negra and Caldera Colorada, Parque Natural Los Volcanes, Masdache, Lanzarote, Canary islands, Spain, Atlantic, Europe

Sulphur encrusted fumaroles at Papandayan Volcano, an active four crater caldera, Garut, West Java, Java, Indonesia, Southeast Asia, Asia

Fumaroles on collapsed side of Papandayan Volcano, an active four crater caldera, Garut, West Java, Java, Indonesia, Southeast Asia, Asia

Telescope observatory, Caldera de Taburiente National Park, UNESCO Biosphere Site, La Palma, Canary Islands, Spain, Atlantic, Europe

Oia village perched on Santorini caldera rim, Oia, Santorini, Cyclades Islands, Greek Islands, Greece, Europe

Aerial view of Telescope observatory, near Caldera de Taburiente National Park, UNESCO Biosphere Site, La Palma, Canary Islands, Spain, Atlantic, Europe

Mud being ejected from the caldera floor of an active andesite stratovolcano on White Island, North Island, New Zealand, Pacific

Visitors watching mud being ejected from the caldera floor of an active andesite stratovolcano on White Island, North Island, New Zealand, Pacific

Mud being ejected from the caldera floor of an active andesite stratovolcano on White Island, North Island, New Zealand, Pacific

Mount Rinjani caldera, Segara Anak lake and the active volcano, Gunung Baru, Lombok, Indonesia, Southeast Asia, Asia

Panorama of Quilotoa, a water-filled caldera and the most western volcano in the Ecuadorian Andes, Ecuador, South America

The caldera floor of an active andesite stratovolcano on White Island, North Island, New Zealand, Pacific

Quilotoa, a water-filled caldera and the most western volcano in the Ecuadorian Andes, Ecuador, South America

Panorama of Quilotoa, a water-filled caldera and the most western volcano in the Ecuadorian Andes, Ecuador, South America

Telescope observatory, Caldera de Taburiente National Park, UNESCO Biosphere Site, La Palma, Canary Islands, Spain, Atlantic, Europe

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

Steps leading to white church with blue dome overlooking the Caldera, Oia, Santorini, Cyclades, Greek Islands, Greece, Europe

White church with blue dome overlooking the Caldera, Oia, Santorini, Cyclades Islands, Greek Islands, Greece, Europe

A woman started at Quilotoa, a water-filled caldera and the most western volcano in the Ecuadorian Andes, Ecuador, South America

White church with blue dome and pink belltower overlooking the Caldera, Oia, Santorini, Cyclades Islands, Greek Islands, Greece, Europe

Evening view over the Caldera from Oia with blue domed church and distant volcanic cliffs, Santorini, Greek Islands, Greece, Europe

White church belltowers overlooking the Caldera, Oia, Santorini, Cyclades, Greek Islands, Greece, Europe

Gunung Barujari volcano in the Mount Rinjani caldera, Mount Rinjani, Lombok, Indonesia, Southeast Asia, Asia

White church with blue dome overlooking the Caldera, Oia, Santorini, Cyclades, Greek Islands, Greece, Europe

White church with blue dome overlooking the Caldera, Oia, Santorini, Cyclades Islands, Greek Islands, Greece, Europe

White church belltowers overlooking the Caldera, Oia, Santorini, Cyclades, Greek Islands, Greece, Europe

Classic view over the Caldera showing blue domed church and pink belltower, Oia, Santorini, Greek Islands, Greece, Europe

Caldera Colorado, volcanic landscape, Parque Nacional de Timanfaya, Lanzarote, Canary Islands, Spain, Europe

Chapel roof with view of the caldera, Oia, Santorini, The Cyclades, Aegean Sea, Greek Islands, Greece, Europe

View of Parc Nacional de la Caldera de Taburiente from Roque de los Muchachos, La Palma, Canary Islands, Spain, Atlantic, 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.

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.

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.

Observatory Gran Telescopio Canarias, Roque de los Muchachos, Parque Nacional de la Caldera de Taburiente, La Palma, Canary Islands, Spain, Europe

Grave site at the abandoned former whaling station at Port Foster inside of the caldera at Deception Island, Antarctica, Polar Regions

February 23, 2013 - Powerful night time explosive eruption of Sakurajima volcano, Japan. Trajectories of glowing incandescent volcanic bombs are visible.

February 23, 2013 - Powerful night time explosive eruption of Sakurajima volcano, Japan. Trajectories of glowing incandescent volcanic bombs are visible. Static lightning discharges are visible at top of picture.

December 3, 2012 - Colourful crater lakes of Kelimutu volcano, Flores Island, Indonesia. Tiwu Nua Muri Kofah (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.

December 3, 2012 - Colourful crater lakes of Kelimutu volcano, Flores Island, Indonesia. A crater wall separates 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.

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 - Lava in crater glowing during blue hour on Nyamuragira Volcano, Kimanura Eruption.

January 22, 2012 - Glowing lava in crater illuminating gas cloud above Nyamuragira Volcano, Kimanura Eruption.

January 22, 2012 - Bush silhouetted against glow of lava in crater of Nyamuragira Volcano, Kimanura Eruption.