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Antelope Canyon, Navajo Tribal Park, Page, Arizona, United States of America, North America
The Giants Causeway, UNESCO World Heritage Site, County Antrim, Ulster, Northern Ireland, United Kingdom, Europe
Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
West Rim, Grand Canyon and Colorado River, UNESCO World Heritage Site, Arizona, United States of America, North America
Park Avenue, Arches National Park, Moab, Utah, United States of America, North America
Arches National Park, Moab, Utah, United States of America, North America
The Giants Causeway, UNESCO World Heritage Site, County Antrim, Ulster, Northern Ireland, United Kingdom, Europe
Long tail boats on Tonsai beach and karst landscape in Railay, Ao Nang, Krabi Province, Thailand, Southeast Asia, Asia
A waterfall at Wan Xian mountain recreation area, Huixian city, Henan Province, China, Asia
Tourists horse trekking, Valle de la Luna (Valley of the Moon), Atacama Desert, Norte Grande, Chile, South America
Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Sandstone buttes in Monument Valley Navajo Tribal Park on the Arizona-Utah border, United States of America, North America
Visitor admiring the white limestone cliffs of the Scala dei Turchi, Realmonte, Porto Empedocle, Agrigento, Sicily, Italy, Mediterranean, Europe
Tourists gather to watch Strokker geyser (geysir), an erupting spring at Haukadalur, Iceland, Polar Regions
The Giants Causeway, UNESCO World Heritage Site, County Antrim, Ulster, Northern Ireland, United Kingdom, Europe
Railay beach and karst scenery in Railay, Ao Nang, Krabi Province, Thailand, Southeast Asia, Asia
Bryce Canyon National Park, Utah, United States of America, North America
Sandstone buttes in Monument Valley Navajo Tribal Park on the Arizona-Utah border, United States of America, North America
Two hikers looking at the Aletsch glacier, Aletsch, Goms Region, Switzerland, Europe
Trekking in the Cederberg Mountains, Western Cape, South Africa, Africa
Tourist hiking in Saklikent Gorge, Saklikent National Park, Fethiye Province, Lycia, Anatolia, Turkey, Asia Minor, Eurasia
Elephant Butte, Arches National Park, Moab, Utah, United States of America, North America
Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Mesa Arch, Canyonlands National Park, Moab, Utah, United States of America, North America
Arches National Park, Moab, Utah, United States of America, North America
Arches National Park, Moab, Utah, United States of America, North America
Maid of the Mist tour boat approaching the Canadian Falls, Niagara Falls, Ontario, Canada, North America
Kaleto Rock Fortress, rock formations, Belogradchik, Bulgaria, Europe
Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Sky Walk over the Grand Canyon and Colorado River, UNESCO World Heritage Site, Arizona, United States of America, North America
Bryce Canyon National Park, Utah, United States of America, North America
Windows Arches, Arches National Park, Moab, Utah, United States of America, North America
Chapman's Pool, Jurassic Coast, Isle of Purbeck, South Dorset
Sky Walk over the Grand Canyon and Colorado River, UNESCO World Heritage Site, Arizona, United States of America, North America
Mesa Arch, Canyonlands National Park, Moab, Utah, United States of America, North America
Mesa Arch, Canyonlands National Park, Moab, Utah, United States of America, North America
Windows Arches, Arches National Park, Moab, Utah, United States of America, North America
Vietnam, tourist and fishing boats in halong bay
Windows Arches, Arches National Park, Moab, Utah, United States of America, North America
Perito Moreno Glacier, Los Glaciares National Park, UNESCO World Heritage Site, Patagonia, Argentina, South America
Camping below Vilyuchinsk volcano, Kamchatka, Russia, Eurasia
Briksdal glacier, Sogn and Fjordane, Norway, Scandinavia, Europe
Tourists climbing at Wadi Rum, Jordan, Middle East
Tourists inspecting the large halite salt crystal formations, Devils Golf Course, Death Valley National Park, California, United States of America, North America
Close-up of pitch at the world's largest natural pitch lake, 90 meters deep, Trinidad, West Indies, Caribbean, Central America
Tourist walks round Masaya crater, Santiago crater, Park National Volcan Masaya, Masaya, Nicaragua, Central America
The Burren and Galway Bay from Corkscrew Hill, Cappanawalla left Finvarra Point right, County Clare, West of Ireland
The Burren famous glaciated karst pavement landscape of limestone and dry stone walls, County Clare, West of Ireland
The Burren and Galway Bay from Corkscrew Hill, Cappanawalla left Finvarra Point right, County Clare, West of Ireland
Limestone pavement glaciated karst landscape and native flora in The Burren, County Clare, West of Ireland
Limestone pavement glaciated karst landscape in The Burren, County Clare, West of Ireland
Poulnabrone Portal Dolmen megalythic burial tomb, 3800BC, in The Burren glaciated landscape, County Clare, Ireland
Limestone pavement glaciated karst landscape in The Burren, County Clare, West of Ireland
Wild native flower flora and limestone pavement glaciated karst landscape in The Burren, County Clare, West of Ireland
Hikers exploring the active hot spring area at Kerlingarfjoll, Iceland, Polar Regions
Hikers taking a rest above the Skaftafellsjokull glacier, Skaftafellsa glacial river in the background, in Skaftafell National Park, south-east Iceland (Austurland), Iceland, Polar Regions
A hiker on Poon Hill looks towards Dhaulagiri Himal, Annapurna Conservation Area, Dhawalagiri (Dhaulagiri), Western Region, Nepal, Asia
Salina Turda, underground salt mine tourist attraction in Turda city, Romania, Europe
Rudolf Mine in Salina Turda salt mine in Turda city, Romania, Europe
Rudolf Mine in Salina Turda salt mine in Turda city, Romania, Europe
Tunnel of Salina Turda, well known landmark in Turda, Transylvania, Romania, Europe
Jameos del Agua lava tunnel formed in a museum of Cesar Manrique, Lanzarote, Canary Islands, Spain, Atlantic, Europe
Jameos del Agua lava tunnel formed in a museum of Cesar Manrique, Lanzarote, Canary Islands, Spain, Atlantic, Europe
The Saddle of Cathedral Rock, Sedona, Arizona, United States of America, North America
The Saddle of Cathedral Rock, Sedona, Arizona, United States of America, North America
Devils Bridge, Sedona, Arizona, United States of America, North America
Zodiac cruises through a natural arch of columnar basalt on the southern coast of Disko Island, Kuannersuit, Greenland, Polar Regions
Little tourist boat ships beside a large monolith in the Avacha Bay near Petropavlovsk-Kamchatsky, Kamchatka, Russia, Eurasia
Visitors from ice-breaker tour ship, July 14 Glacier, Krossfjorden, Spitsbergen, Svalbard, Norway, Scandinavia, Europe
Strokkur at full height, the powerful geyser that erupts every 10 minutes, beside the now-inactive Geysir, southeast Iceland, Iceland, Polar Regions
Manjanggul longest lava tube system in the world on the island of Jejudo, UNESCO World Heritage Site, South Korea, Asia
Tourist standing on rock cliff looking at Band-I-Zulfiqar the main lake, Band-E- Amir (Bandi-Amir) (Dam of the King) crater Lakes, Bamian province, Afghanistan, Asia
Hot air ballooning over rock formations, Cappadocia, Anatolia, Turkey, Asia Minor, Asia
Underground lake in the Salt Mine, Salina Turda museum in Transylvania, Romania, Europe
Tourists walking on lava flow on Isla Santiago, Sullivan Bay, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America
Thingvellir, site of original 10th century Althingi (Parliament) and geographical rift between Europe and North America, Iceland, Polar Regions
Valley of Goreme, central Cappadocia, Anatolia, Turkey, Asia Minor, Asia
Visitors at an active andesite stratovolcano on White Island, North Island, New Zealand, Pacific
Sea and salt formations with hotels and desert cliffs beyond, Ein Bokek Hotel Resort, Dead Sea, Israel, Middle East
Pohutu Geyser at Te Puia Wakarewarewa Geothermal Village, Rotorua, Taupo Volcanic Zone, North Island, New Zealand, Pacific
Tourists at Valle de la Luna (Valley of the Moon), La Paz, La Paz Department, Bolivia, South America
Uluru (Ayers Rock), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
Tourists viewing the Morning Glory Pool, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Tourists on terraces, Pamukkale, UNESCO World Heritage Site, Anatolia, Turkey, Asia Minor, Eurasia
Queen's Head, coastal rock formations, Yehliu, Taipei County, Taiwan, Asia
Hot steam, Craters of the Moon Thermal Area, Taupo, North Island, New Zealand, Pacific
The world's largest natural pitch lake, 90 meters deep, Trinidad, West Indies, Caribbean, Central America
The Olgas, Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
Cliffs of Wadi Saydran, below Jabal Shams, abandoned village of Sap Bani Khamis is on ledges above the large overhang, high point of Jabal Akhdar mountains, northern Oman, Middle East
Thingvellir, site of original 10th century Althingi (Parliament) and geographical rift between Europe and North America, Iceland, Polar Regions
Sulphur springs, Soufriere, St. Lucia, Windward Islands, West Indies, Caribbean, Central America
Examining dinosaur tracks, Broome, Kimberley, Western Australia, Australia, Pacific
Tourists around the hot mud pools at Namaskard thermal area, Hverarond, near Lake Myvatn, North area, Iceland, Polar Regions
Tourists on viewing platform, Punakaiki, Pancake Rocks and blowholes, Paparoa National Park, Westland, South Island, New Zealand, Pacific
Drogarati Cave, near Sami, Kefalonia (Cephalonia), Ionian Islands, Greece, Europe
Man watching an active lava stream, Tolbachik volcano, Kamchatka, Russia, Eurasia
Hiker and view to the Breithorn and Breithorn Glacier, Gomergrat, Zermatt, Valais, Switzerland, Europe
The world's largest natural pitch lake, 90 meters deep, Trinidad, West Indies, Caribbean, Central America