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Koryaksky volcano seen beyond walkers on crater rim of Avacha volcano, Kamchatka, East Siberia, Russia

Deer Cave with show cave path, largest cave passage in the world, Gunung Mulu National Park, Sarawak, island of Borneo, Malaysia

View from Pyramid of the Moon of the Avenue of the Dead and the Pyramid of the Sun in background, Teotihuacan, 150AD to 600AD and later used by the Aztecs, UNESCO World Heritage Site, north of Mexico City, Mexico, North America

Tourist boat floating through the Puerto Princesa underground river, the New Wonder of the World, Puerto-Princesa Subterranean River National Park, UNESCO World Heritage Site, Palawan, Philippines, Southeast Asia, Asia

Tourists in a rowing boat entering the Puerto Princesa underground river, the New Wonder of the World, Puerto-Princesa Subterranean River National Park, UNESCO World Heritage Site, Palawan, Philippines, Southeast Asia, Asia

Tourist boat floating through the Puerto Princesa underground river, the New Wonder of the World, Puerto-Princesa Subterranean River National Park, UNESCO World Heritage Site, Palawan, Philippines, Southeast Asia, Asia

Pia Glacier, Beagle Channel, Darwin National Park, Tierra del Fuego, Patagonia, Chile, South America

Pia Glacier, Beagle Channel, Darwin National Park, Tierra del Fuego, Patagonia, Chile, South America

Hiker on trail above lake at Schwarzee Paradise, Zermatt Alpine Resort, The Valais, Swiss Alps, Switzerland, Europe

Person kayaking near icebergs, Lago Gray (Lake Gray) (Lake Grey), Torres del Paine National Park, Patagonia, Chile, South America

Person kayaking near icebergs, Lago Gray (Lake Gray) (Lake Grey), Torres del Paine National Park, Patagonia, Chile, South America

Person kayaking near icebergs, Lago Gray (Lake Gray) (Lake Grey), Torres del Paine National Park, Patagonia, Chile, South America

Landscape overview, Hurulu Eco Park biosphere reserve, Habarana, Anuradhapura District, Sri Lanka, Asia

Buildings of rock palace fortress on rock summit, Sigiriya, UNESCO World Heritage Site, Central Province, Sri Lanka, Asia

Metal staircase climbing to rock palace fortress, Sigiriya, UNESCO World Heritage Site, Central Province, Sri Lanka, Asia

Metal staircase climbing to rock palace fortress, Sigiriya, UNESCO World Heritage Site, Central Province, Sri Lanka, Asia

Columbia Icefield, Jasper National Park, UNESCO World Heritage Site, Rocky Mountains, Alberta, Canada, North America

Viewing fur seals on pack ice in the Antarctic Sound, Antarctic Peninsula, Antarctica, Polar Regions

Zodiac ferrying visitors to and from boat at Brown Bluff, Antarctic Peninsula, Antarctica, Polar Regions

Walkers crossing stepping stones over a cascading stream in Tollymore Forest Park, County Down, Ulster, Northern Ireland, United Kingdom, Europe

Passengers view glacier in Store Jonsfjord, Svalbard Archipelago, Norway, Arctic, Scandinavia, Europe

Biologist taking skin sample from a whale shark to determine what plankton types the animal has been feeding on, Yum Balam Marine Protected Area, Quintana Roo, Mexico, North America

Scientist free diving to make a photo identification of an individual manta ray (Manta birostris), Yum Balam Marine Protected Area, Quintana Roo, Mexico, North America

Diver swimming underwater with Bigeye trevally (Caranx sexfasciatus) (jacks) at Sipadan Island, Celebes Sea, Sabah, Malaysia, Southeast Asia, Asia

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

Visitors to an active andesite stratovolcano on White Island, off the East side of North Island, New Zealand, Pacific

The small fishing village of Mandrakia, Mandrakia, Milos Island, Cyclades Islands, Greek Islands, Greece, Europe

The Puerta de la Mar (Gateway to the Sea) arches, Plaza de la Puerta del Mar, Valencia, Spain, Europe

Church of Saint Andrew Anglican Church, Grand Socco, old Medina, Tangier, Morocco, North Africa, Africa

Aerial image of Stavros beach, where Zorba the Greek dance was filmed, near Chania, Crete Island, Greek Islands, Greece, Europe

The Alcazaba and Castle of Gibralfaro on Mount Malaga above the old town, Malaga, Costa del Sol, Andalusia, Spain, Europe

Views of the harbour from the Alcazaba and Castle of Gibralfaro on Mount Malaga above the old town, Malaga, Costa del Sol, Andalusia, Spain, Europe

Views of old town from the Alcazaba and Castle of Gibralfaro on Mount Malaga above the old town, Malaga, Costa del Sol, Andalusia, Spain, Europe

Views of old town from the Alcazaba and Castle of Gibralfaro on Mount Malaga above the old town, Malaga, Costa del Sol, Andalusia, Spain, Europe

The Infante Dom Henrique Bridge (Infante Bridge) over the Douro River, Porto, Norte, Portugal, Europe

Rabelo boats near the Dom Luis I Bridge (Luis I Bridge) over the Douro River, UNESCO World Heritage Site, Porto, Norte, Portugal, Europe

Foz de Iguazu (Iguacu Falls), Iguazu National Park, UNESCO World Heritage Site, Argentina, South America

Fountain in Pedro Luis Alonso Gardens (Jardines de Pedro Luis Alonso) and the Ayuntamiento de Malaga (Malaga City Hall), Malaga, Costa del Sol, Andalusia, Spain, Europe

Plaza Mayor (Main Square), Torre de Bujaco (Bujaco Tower) Old Town, UNESCO World Heritage Site, Caceres, Extremadura, Spain, Europe

Ruins of pre-Spanish Mahos village, Poblado de la Atalayita, Pozo Negro, Fuerteventura, Canary Islands, Spain, Atlantic, Europe

Mirador Sicasumbre mountain top viewpoint, Pajara, Fuerteventura, Canary Islands, Spain, Atlantic, Europe

Mirador Sicasumbre mountain top viewpoint, Pajara, Fuerteventura, Canary Islands, Spain, Atlantic, Europe

Car driving on unsurfaced road, Atlantic Ocean coast, Jandia peninsula, Fuerteventura, Canary Islands, Spain, Atlantic, Europe

Footpath trail from Gran Valle to Cofete, Jandia peninsula, Fuerteventura, Canary Islands, Spain, Atlantic, Europe

Start of footpath trail from Gran Valle to Cofete, Jandia peninsula, Fuerteventura, Canary Islands, Spain, Atlantic, Europe