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

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

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

Splashes of sulphur colouring Stefanos crater ground, Nisyros Island, Dodecanese Islands, Greek Islands, Greece, Europe

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

Mesa Verde National Park, Spruce Tree House, UNESCO World Heritage Site, Colorado, United States of America, North America

Mesa Verde National Park, Fire Temple, UNESCO World Heritage Site, Colorado, United States of America, North America

Stela A dating from 731 AD, Copan Archaeological Park, UNESCO World Heritage Site, Copan, Honduras, Central America

Mesa Verde National Park, Cliff Palace, UNESCO World Heritage Site, Colorado, United States of America, North America

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

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

Ruins of ancient Roman baths, Antonine Baths, Carthage, UNESCO World Heritage Site, Tunis, Tunisia, North Africa, Africa

Ruins of ancient Roman baths, Antonine Baths, Carthage, UNESCO World Heritage Site, Tunis, Tunisia, North Africa, Africa

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

Chacmool statue, Chankanaab National Park, Cozumel Island (Isla de Cozumel), Quintana Roo, Mexico, Caribbean, North America

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

California gray whale (Eschrichtius robustus) and excited whale watchers, San Ignacio Lagoon, Baja California Sur, Mexico, North America

Leatherback turtle (Dermochelys coriacea) eggs being collected for transfer to a safer hatchery location, Shell Beach, Guyana, South America

Researchers measuring a female Leatherback turtle (Dermochelys coriacea) at its nest site, Shell Beach, Guyana, South America

Turtle warden with nesting Leatherback turtle (Dermochelys coriacea), Shell Beach, Guyana, South America

Leatherback turtle (Dermochelys coriacea) eggs being collected for transfer to a safer hatchery location, Shell Beach, Guyana, South America

Woman climbing stairs at Mayan archaeological site, Tikal, UNESCO World Heritage Site, Guatemala, Central America

Horse riding trip, tourist with Navajo guide pass under rock arch, Monument Valley Navajo Tribal Park, Utah Arizona, United States of America, North America

Navajo person rides a horse between rock formations, Monument Valley Navajo Tribal Park, Utah Arizona, United States of America

An ancient stone statue, San Agustin Archaeological Park, UNESCO World Heritage Site, Colombia, South America

The stone built Neolithic settlement of Skara Brae, UNESCO World Heritage Site, Orkney Islands, Scotland, United Kingdom, Europe

The stone built Neolithic settlement of Skara Brae, UNESCO World Heritage Site, Orkney Islands, Scotland, United Kingdom, Europe

Wall Mural of Jaguar, Palace of Tetitla, Teotihuacan Archaeological Zone, UNESCO World Heritage Site, State of Mexico, Mexico, North America

Bayanzag Cliffs, site of dinosaur fossil discoveries, Dalanzadgad, Gobi Desert, southern Mongolia, Asia

16 Room House Anasazi Ruins, Ancestral Pueblo, Navajo Reservation, near Bluff, Utah, United States of America, North America

16 Room House Anasazi Ruins, Ancestral Pueblo, Navajo Reservation, near Bluff, Utah, United States of America, North America

Big Crane Pictograph, made by Ancestral Puebloans, approximately 900-1000 years old, Bear's Ears National Monument, Utah, United States of America, North America

Over Under Anasazi Ruins, Ancestral Pueblo, Bear's Ears National Monument, Utah, United States of America, North America

Whale shark (Rhincodon typus) with rainbow runner observed by a tourist and guide in Honda Bay, Palawan, The Philippines, Southeast Asia, Asia

Tourists snorkelling with a whale shark (Rhincodon typus) in Honda Bay, Palawan, The Philippines, Southeast Asia, Asia

Tourists snorkelling with a whale shark (Rhincodon typu ) in Honda Bay, Puerto Princesa, Palawan, The Philippines, Southeast Asia, Asia

Tourist snorkelling with a whale shark (Rhincodon typus) in Honda Bay, Palawan, The Philippines, Southeast Asia, Asia

Tourist and tour guide swimming with a whale shark (Rhincodon typus) in Honda Bay, Palawan, The Philippines, Southeast Asia, Asia

Tourist snorkelling with a whale shark (Rhincodon typus) in Honda Bay, Palawan, The Philippines, Southeast Asia, Asia

Snorkeller with a juvenile whale shark (Rhincodon typus) feeding on the suface in Honda Bay, Palawan, The Philippines, Southeast Asia, Asia

Snorkeller swimming with a juvenile whale shark (Rhincodon typus) in Honda Bay, Palawan, The Philippines, Southeast Asia, Asia

Tourists snorkelling with a whale shark (Rhincodon typus) in Honda Bay, Palawan, The Philippines, Southeast Asia, Asia

Snorkeller with oceanic manta ray (Manta birostris) feeding near the surface, Honda Bay, Palawan, The Philippines, Southeast Asia, Asia