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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

Hiker on a trail around the Forcella De Furcia at sunrise, Val di Funes, South Tyrol, Dolomites, Italy, Europe

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

Bathing pool in rock palace fortress on rock summit, Sigiriya, UNESCO World Heritage Site, Central Province, 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

Bathing pool in rock palace fortress on rock summit, Sigiriya, UNESCO World Heritage Site, Central Province, Sri Lanka, Asia

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

The Wolfs Lair, Hitler's World War II secret bunker, Bunker 13 (Hitler's bunker), Masuria, Poland, Europe

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

Hikers admire the peaks of Forcella De Furcia at sunrise, Funes Valley, South Tyrol, Dolomites, Italy, Europe

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

Fishing on the ice, Maloe More (Little Sea), frozen lake during winter, Olkhon island, Lake Baikal, UNESCO World Heritage Site, Irkutsk Oblast, Siberia, Russia, Eurasia

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

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

Tourist at Sigiriya Rock Fortress (Lion Rock), UNESCO World Heritage Site, Sigiriya, Cultural Triangle, Sri Lanka, Asia

Trail between Namche Bazaar and Everest View Hotel, with Mt. Thamserku behind, Sagarmatha National Park, UNESCO World Heritage Site, Nepal, Himalayas, Asia

Fortress medina and Borj Dar El Baroud Tower at Port of Tangier, Tangier, Morocco, North Africa, Africa

Kasbah Museum of Mediterranean Cultures in the Sultan's Palace (Governor's Palace), old Medina, Tangier, Morocco, North Africa, Africa

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

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

Girl looking for the sea in the Sahara desert, Erg Awbari, Sahara desert, Fezzan, Libya, North Africa, Africa

Four Masai hunters running through bush holding spears, Masai Mara National Reserve, Kenya, East Africa, Africa

Abandoned Dawada oasis village at Gabraoun, Touareg, Gabroun, Sahara desert, Fezzan, Libya, North Africa, Africa

View of Chora village and Sifnos island in the distance, Chora, Serifos Island, Cyclades, Greek Islands, Greece, Europe

View of Chora village and the port of Livadi and Sifnos island in the distance, Chora, Serifos Island, Cyclades, Greek Islands, Greece, Europe

Fortress of Frederick II of Swabia, Castel del Monte, Andria, Western Murge, Barletta, Apulia, Italy, Europe

Fortress of Frederick II of Swabia, Castel del Monte, Andria, Western Murge, Barletta, Apulia, Italy, Europe

Fortress of Frederick II of Swabia, Castel del Monte, Andria, Western Murge, Barletta, Apulia, Italy, Europe

Fortress of Frederick II of Swabia, Castel del Monte, Andria, Western Murge, Barletta, Apulia, Italy, Europe

Fortress of Frederick II of Swabia, Castel del Monte, Andria, Western Murge, Barletta, Apulia, Italy, Europe

Fortress of Frederick II of Swabia, Castel del Monte, Andria, Western Murge, Barletta, Apulia, Italy, Europe

Fortress of Frederick II of Swabia, Castel del Monte, Andria, Western Murge, Barletta, Apulia, Italy, Europe

Fortress of Frederick II of Swabia, Castel del Monte, Andria, Western Murge, Barletta, Apulia, Italy, Europe

Fortress of Frederick II of Swabia, Castel del Monte, Andria, Western Murge, Barletta, Apulia, Italy, Europe

Fortress of Frederick II of Swabia, Castel del Monte, Andria, Western Murge, Barletta, Apulia, Italy, Europe