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

Ruins of early Bronze Age house, about 3500 years old, Grimspound, Dartmoor National Park, Devon, England, United Kingdom, Europe

Ruins of early Bronze Age house, about 3500 years old, Grimspound, Dartmoor National Park, Devon, England, United Kingdom, Europe

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

The main open chaitya (temple) in the Bhaja Caves, excavated in basalt, Lonavala, Western Ghats, Maharashtra, India, Asia

The main open chaitya (temple) in the Bhaja Caves, excavated in basalt, Lonavala, Western Ghats, Maharashtra, India, Asia

Woman walking steps out of a ice cave in Fox Glacier, Westland Tai Poutini National Park, South Island, New Zealand, Pacific

Woman standing in an ice cave, Fox Glacier, Westland Tai Poutini National Park, South Island, New Zealand, Pacific

Hikers from the cablecar near the smoking summit of 3350m volcano Mount Etna during an active phase, Mount Etna, UNESCO World Heritage Site, Sicily, Italy, Mediterranean, Europe

Man hiking on Waiomu Kauri Grove trail, Thames, Coromandel Peninsula, Waikato, North Island, New Zealand, Pacific

Rano Raraku, the quarry site for all moai statues on Easter Island (Isla de Pascua) (Rapa Nui), UNESCO World Heritage Site, Chile, South America

Fallen moai head and red scoria topknot at Ahu Akahanga on Easter Island (Isla de Pascua) (Rapa Nui), UNESCO World Heritage Site, Chile, South America

Detail of a moai at Ahu Akivi, the first restored altar on Easter Island (Isla de Pascua) (Rapa Nui), UNESCO World Heritage Site, Chile, South America

Seven Moai at Ahu Akivi, the first restored altar on Easter Island (Isla de Pascua) (Rapa Nui), UNESCO World Heritage Site, Chile, South America

Rano Raraku, the quarry site for all moai statues on Easter Island (Isla de Pascua) (Rapa Nui), UNESCO World Heritage Site, Chile, South America

Seven Moai at Ahu Akivi, the first restored altar on Easter Island (Isla de Pascua) (Rapa Nui), UNESCO World Heritage Site, Chile, South America

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

Concordia Temple, Valley of the Temples (Valle dei Templi), UNESCO World Heritage Site, Agrigento, Sicily, 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

Tourist exploring the tunnels at the Greek ruins, Eurialo Casle (Castello Eurialo), Syracuse (Siracusa), Sicily, Italy, Europe

Tourist taking a photo at Temple of Juno, Valley of the Temples (Valle dei Templi), Agrigento, UNESCO World Heritage Site, Sicily, Italy, Europe

Mammoth tusk in a riverbed near Doubtful village, Wrangel Island, UNESCO World Heritage Site, Chuckchi Sea, Chukotka, Russian Far East, Russia, Eurasia

Young woman enjoying the coast, Second Beach, Olympic National Park, UNESCO World Heritage Site, Washington State, United States of America, North America

Stone carving, Palace of the Masks, Codz Poop, Kabah Archaeological Site, Kabah, near Uxmal, Yucatan, Mexico, North America

Tourist at Bambarakanda Falls, a waterfall near Haputale, Sri Lanka Hill Country, Nuwara Eliya District, Sri Lanka, Asia

Wooden horse cart taking tourists around Bagan temples, Bagan (Pagan), Central Myanmar, Myanmar (Burma), Asia

Dawn over ancient temples from hot air balloon, Bagan (Pagan), Central Myanmar, Myanmar (Burma), Asia

Littered beluga bones left by whalers, Delphinapterus leucas, at Ahlstrandhalvoya, Bellsund, Svalbard, Norway, Scandinavia, Europe

Message in a bottle at the beach of Risco del Paso, Fuerteventura, Canary Islands, Spain, Atlantic, Europe

Ruined city of Nan Madol, Pohnpei (Ponape), Federated States of Micronesia, Caroline Islands, Central Pacific, Pacific

Ruined city of Nan Madol, Pohnpei (Ponape), Federated States of Micronesia, Caroline Islands, Central Pacific, Pacific

Ruined city of Nan Madol, Pohnpei (Ponape), Federated States of Micronesia, Caroline Islands, Central Pacific, Pacific

Ruined city of Nan Madol, Pohnpei (Ponape), Federated States of Micronesia, Caroline Islands, Central Pacific, Pacific

Ruined city of Nan Madol, Pohnpei (Ponape), Federated States of Micronesia, Caroline Islands, Central Pacific, Pacific

Ruined city of Nan Madol, Pohnpei (Ponape), Federated States of Micronesia, Caroline Islands, Central Pacific, Pacific

Amphitheatre, ruins of the Roman-Byzantine city of Scythopolis, Tel Beit Shean National Park, Beit Shean, Israel, Middle East

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

Ruined prehistoric farmhouse, near Headland Warren, Dartmoor National Park, Devon, England, United Kingdom, Europe

Green sea turtle (Chelonia mydas) underwater with snorkeler, Maui, Hawaii, United States of America, Pacific

Monolithic rock-cut Church of Bete Giyorgis (St. George), UNESCO World Heritage Site, Lalibela, Amhara region, Northern Ethiopia, Africa

View over St. Pauls Bay from the Acropolis of Lindos, Rhodes, Dodecanese, Greek Islands, Greece, Europe

Tourist admiring the Giant Sequoia trees (Sequoiadendron giganteum), on the Big Trees trail, Round Meadow, Sequoia National Park, Sierra Nevada, California, United States of America, North America

Tourist admiring the Giant Sequoia trees (Sequoiadendron giganteum), hiking on the Big Trees trail, Round Meadow, Sequoia National Park, Sierra Nevada, California, United States of America, North America

Tourist hiker, admiring the Giant Sequoia trees (Sequoiadendron giganteum), known as the Parker Group, Sequoia National Park, Sierra Nevada, California, United States of America, North America

Avenue of the Sarcophagi, Alyscamps, UNESCO, Arles, Bouches du Rhone, Camargue, Provence-Alpes-Cote d'Azur, France

Woman tourist walking on the Great Wall of China, UNESCO World Heritage Site, Mutianyu, Beijing District, China, Asia

Roman mosaic at Villa Romana del Casale, UNESCO World Heritage Site, Piazza Armerina, Sicily, Italy, Europe

Snow covered mountain and tourists, Half Moon Island, South Shetland Islands, Antarctic Peninsula, Antarctica, Polar Regions

Rusted remains of an old whaling ship off Enterprise Island, Antarctic Peninsula, Antarctica, Polar Regions

Tourists hiking down the mountainside towards Whalers Bay, 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

St. Michael de Rupe church at Brentor (Brent Tor), Dartmoor National Park, Devon, England, United Kingdom, Europe

California gray whale (Eschrichtius robustus) touched by excited whale watcher, San Ignacio Lagoon, Baja California Sur, Mexico, North America