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The fire watchtower on the summit of O'Leary Peak in the Coconino National Forest of Arizona. Adjacent to the Sunset Crater National Monument.

Forest Service Road that leads to the O'Leary Peak Watchtower and Overlook. Adjacent to Sunset Crater National Monument Arizona in the Coconino National Forest.

A snow squall storm building up over Humphrey's Peak. Viewed from O'Leary Peak in the Coconino National Forest of Arizona. Adjacent to Sunset Crater National Monument.

End of the Forest Service Road that leads to the O'Leary Peak Watchtower and Overlook. The metal grating is to add traction for vehicles. Adjacent to Sunset Crater National Monument Arizona in the Coconino National Forest.

A snow squall storm building up over Humphrey's Peak. Viewed from O'Leary Peak in the Coconino National Forest of Arizona. Adjacent to Sunset Crater National Monument.

Dead trees from a past forest fire on the slope of O'Leary Peak in northern Arizona. Sunset Crater Volcano is in the background.

The eastern summit of O'Leary Peak in the Coconino National Forest of Arizona. Adjacent to the Sunset Crater National Monument.

Birdman petroglyphs at Orongo ceremonial village on rim of crater Rano Kau, offshore lie bird islands of Motu Kao Kao, Motu Iri and Motu Nui, Easter Island, Chile, Pacific

Aerial view, Volcano in Parque Natural de los Volcanes, Timanfaya, Lanzarote, Canary Islands, Spain, Atlantic, Europe

Morning Glory Pool, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Tourists on the boardwalk around the Grand Prismatic Spring, Midway Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Hot volcanic steam rising into monsoon clouds from Kawah Ratu (Queen's Crater) of Mount Tangkuban, Perahu, Bandung, Java, Indonesia, Southeast Asia, Asia

Hot volcanic steam rising into monsoon clouds from Kawah Ratu (Queen's Crater) of Mount Tangkuban, Perahu, Bandung, Java, Indonesia, Southeast Asia, Asia

Adult male Grant's gazelles (Nanger granti), inside Ngorongoro Crater, UNESCO World Heritage Site, Tanzania, East Africa, Africa

Rice paddy fields, with heavy monsoon clouds gathering over volcanic crater hills across Lake Toba from Samosir Island, Sumatra, Indonesia, Southeast Asia, Asia

Rice paddy fields, with heavy monsoon clouds gathering over volcanic crater hills across Lake Toba from Samosir Island, Sumatra, Indonesia, Southeast Asia, Asia

Thomson's gazelle (Gazella thomsonii) female giving birth, Ngorongoro Crater, Tanzania, East Africa, Africa

View from below the rim of the giant sinkhole known as Johnson Crater in the Kaibab National Forest near Ash Fork Arizona.

View from below the rim of the giant sinkhole known as Johnson Crater in the Kaibab National Forest near Ash Fork Arizona.

View from below the rim of the giant sinkhole known as Johnson Crater in the Kaibab National Forest near Ash Fork Arizona.

View from below the rim of the giant sinkhole known as Johnson Crater in the Kaibab National Forest near Ash Fork Arizona.

Super Panorama of the giant sinkhole known as Johnson Crater in the Kaibab National Forest near Ash Fork Arizona. Created by stitching 5 photos together.

Smoke over the two craters of Erta Ale volcano summit 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

View from Calderon Honda crater of lava rock ruins and volcanic cones of the north, Lajares, Fuerteventura, Canary Islands, Spain, Europe

Green-backed heron (striated heron) (Butorides striatus), immature, Ngorongoro Crater, Tanzania, East Africa, Africa

Two black rhinoceros (hook-lipped rhinoceros) (Diceros bicornis), Ngorongoro Crater, Tanzania, East Africa, Africa

Thomson's gazelle (Gazella thomsonii) buck with reflection, Ngorongoro Crater, Tanzania, East Africa, Africa

Thomson's gazelle (Gazella thomsonii) buck drinking with reflection, Ngorongoro Crater, Tanzania, East Africa, Africa

Serengeti jackal (golden jackal) (Canis aureus bea) pup, Ngorongoro Crater, Tanzania, East Africa, Africa

Grey crowned crane (Southern crowned crane) (Balearica regulorum), Ngorongoro Crater, Tanzania, East Africa, Africa

Serengeti jackal (golden jackal) (Canis aureus bea) pups, Ngorongoro Crater, Tanzania, East Africa, Africa

Gran Cratere (The Great Crater) and Aeolian Islands view, Vulcano Island, Aeolian Islands, UNESCO World Heritage Site, north of Sicily, Italy, Mediterranean, Europe

Tourist jeeps on safari at sunrise, Ngorongoro Crater Conservation Area, UNESCO World Heritage Site, Tanzania, East Africa, Africa

Sunrise, Ngorongoro Crater Conservation Area, UNESCO World Heritage Site, Tanzania, East Africa, Africa

Cattle egret (Bubulcus ibis) and hippo (Hippopotamus amphibius) at a water hole, Ngorongoro Crater, UNESCO World Heritage Site, Tanzania, East Africa, Africa

Cape buffalo (Syncerus caffer) grazing in the Ngorongoro Crater, UNESCO World Heritage Site, Tanzania, East Africa, Africa

Wizard Island in Crater Lake, the deepest lake in the United States, Crater Lake National Park, Oregon, United States of America, North America

Aerial view of Ngorongoro Crater in the Ngorongoro Conservation Area, UNESCO World Heritage Site, Tanzania, East Africa, Africa

Aerial view of Ngorongoro Crater in the Ngorongoro Conservation Area, UNESCO World Heritage Site, Tanzania, East Africa, Africa

Exploring a volcanic landscape on a footpath up Saxholl cinder cone and crater, Snaefellsjokull National Park, western Iceland, Polar Regions

Majestic crater of Hondo volcano (Calderon Hondo) with the ocean in background, Corralejo, Fuerteventura, Canary Islands, Spain, Atlantic, Europe

Calm purple evening light, of blue hour, deep blue Lake Mashu in a crater, Akan Mashu National Park, Hokkaido, Japan, Asia

Panoramic view, crater of Blue Lake and Tongariro Volcano at sunrise, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific

Red Crater and Mount Ngauruhoe in Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific

Emerald Lakes at sunrise, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific

Emerald Lakes at sunrise, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific

Emerald lake on volcano slope, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific

View along the slope and hiking trail up towards the Red Crater Volcano, on Tongariro Alpine Crossing, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific

Close up of turquoise, vibrant Emerald Lake with steaming volcano, Tongariro Crossing, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific

Close up of turquoise, vibrant Emerald Lake with steaming volcano on Tongariro Crossing, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific

Shore of the Emerald Lake, natural vibrant colour gradient with view on the Red Crater Volcano of Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific

Turquoise and yellow green Emerald Lake in front of the Tongariro Volcano, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific

Wide angle view of an Emerald Lake in front of Red Crater Volcano in the Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific

Shore of the Emerald Lake, natural vibrant colour gradient with view on the Red Crater Volcano of Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific

Emerald Lake in Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific

Snow covered frozen Viti (Hell) crater near Krafla power plant, Lake Myvatn, North area, Iceland, Polar Regions

Adult male Grant's gazelles (Nanger granti) sparring inside Ngorongoro Crater, Tanzania, East Africa, Africa

Thomson's gazelles (Eudorcas thomsonii), in Ngorongoro Crater, UNESCO World Heritage Site, Tanzania, East Africa, Africa

People walking on the edge of the crater of Mount Vesuvius, Province of Naples, Campania region, Italy, Europe

People walking through fumaroles on Volcano Gran crater rim, Vulcano Island, Aeolian Islands, UNESCO World Heritage Site, north of Sicily, Italy, Mediterranean, Europe

Flat top acacia trees (Vachellia abyssinica) along a road leading to the Ngorongoro Crater, Tanzania, East Africa, Africa

Lion (Panthera leo), Ngorongoro Crater Conservation Area, UNESCO World Heritage Site, Tanzania, East Africa, Africa

People walking on the edge of the crater of Mount Vesuvius, Province of Naples, Campania region, Italy, Europe