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Trees beside a river frame the snow capped Half Dome mountain in Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Ayers Rock, Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific

Tourists on viewing platform on Canadian side of the waterfall view the Horseshoe Falls at Niagara, Ontario, Canada, North America

The Pont d'Arc, a natural rock arch over the Ardeche River, in the Ardeche Gorges, in the Ardeche region of the Rhone Alpes, France, Europe

The Old Faithful Geyser at Calistoga, erupts 60 ft high every 30 minutes, with a pressure of 1000 lbs per square foot, Napa Valley, California, United States of America, North America

The Chocolate Hills, a famous geological curiosity, with over 1000 of them, on the island of Bohol, the Philippines, Southeast Asia, Asia

Tourist viewing Ayers Rock at dusk, Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific

The perfect cone of Volcan Concepcion, 1610m, one of two volcanoes that make up the island of Omotepe, Nicaragua, Central America

Cuernos del Paine (Horns of Paine) and blue waters of Lake Pehoe, Torres del Paine National Park, Patagonia, Chile, South America

Entrance to Fingal's Cave, columnar basalt rock, Island of Staffa, Argyllshire, Inner Hebrides, Scotland, United Kingdom, Europe

Uluru (Ayers Rock), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific

Aerial view of the Iguassu Falls, Iguassu National Park, UNESCO World Heritage Site, Parana, Brazil, South America

The Giants Causeway, UNESCO World Heritage Site, Co. Antrim, Ulster, Northern Ireland, United Kingdom, Europe

The Giants Causeway, UNESCO World Heritage Site, Co. Antrim, Ulster, Northern Ireland, United Kingdom, Europe

View of the Pitons volcanic mountains, with bougainvillea flowers in foreground, St. Lucia, Windward Islands, West Indies, Caribbean, Central America

Norber erratics near Austwick, erratic boulders left on limestone pavement by erosion, Yorkshire Dales National Park, Yorkshire, England, United Kingdom, Europe

Hikers below Aoraki (Mount Cook), 3755m, the highest peak in New Zealand, Te Wahipounamu UNESCO World Heritage Site, Aoraki (Mount Cook) National Park, Southern Alps, Mackenzie Country, South Island, New Zealand, Pacific

Sunset on the West Face of Aoraki (Mount Cook), 3755m, the highest peak in New Zealand, Te Wahipounamu UNESCO World Heritage Site, Aoraki (Mount Cook) National Park, Southern Alps, Mackenzie Country, South Island, New Zealand, Pacific

Mount Mayon, 2462 m, near-perfect volcano cone with plume of smoke reflected in rice field, Bicol Province, southeast Luzon, Philippines, Southeast Asia, Asia

Mount Mayon, 2462 m, near-perfect volcano cone with plume of smoke, Bicol Province, southeast Luzon, Philippines, Southeast Asia, Asia

The Old Man of Storr, overlooking Loch Leathan and Raasay Sound, Trotternish, Isle of Skye, Inner Hebrides, Scotland, United Kingdom, Europe

Uluru (Ayers Rock), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, with the Olgas in the distance, Northern Territory, Australia, Pacific

Ayers Rock, Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific

Oldonyo Lengai volcano, 2878m, Ngorongoro Conservation Area, UNESCO World Heritage Site, Tanzania, East Africa, Africa

Hikers on walking trail below the Matterhorn mountain in the Swiss Alps near Zermatt, Valais, Switzerland, Europe

Columnar basalt lava with Fingal's Cave cut into it by sea, Staffa, off west coast of Mull, Inner Hebrides, Scotland, United Kingdom, Europe

Frescoes in natural pigments at Sukh Mandir Diwan-I-Khas Pleasure Palace at The Amber Fort in Jaipur, Rajasthan, India

Frescoes in natural pigments at Sukh Mandir Diwan-I-Khas Pleasure Palace at The Amber Fort in Jaipur, Rajasthan, India

Dramatic autumn light on the Old Man of Storr, Isle of Skye, Inner Hebrides, Scotland, United Kingdom, Europe

Devil's Marbles, the result of spheroidal weathering of strong granite beneath an ancient soil, Tennant Creek, Northern Territory, Australia, Pacific

The peaks of Mt. Kenya, seen from the Teleki Valley, with ranger station in foreground, Kenya, East Africa, Africa

Sculpted fountain in front of Natural History Museum (Naturhistorisches Museum), Maria-Theresien-Platz, Vienna, Austria, Europe

The American Falls with the Horseshoe Falls behind, Niagara Falls, New York State, United States of America, North America

Rock formation called The Finger of Allah, Akakus, Sahara desert, Fezzan, Libya, North Africa, Africa

Interior of Casa Batllo, modernism design by Antoni Gaudi, UNESCO World Heritage Site, old town, Barcelona, Catalonia, Spain, Europe

The Caldea, built in the 1990s using natural hot spas it has become a major tourist attraction in the capital, Andorra la Vella, Andorra, Europe

Chalets in a snowy landscape with the Matterhorn peak, near Zermatt, Swiss Alps, Switzerland, Europe

Uluru (Ayers Rock), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific

Tourists dwarfed by the General Sherman Sequoia Tree, largest in the world by volume, Sequoia National Park, California, United States of America, North America

Upper and Lower Yosemite Falls, swollen by summer snowmelt, Yosemite National Park, UNESCO World Heritage Site, California, United States of America

The Giants Causeway, UNESCO World Heritage Site, Co. Antrim, Ulster, Northern Ireland, United Kingdom, Europe

Mount Robson, highest peak in Canadian Rockies, 3964m, seen from Canadian transcontinental express between Jasper and Vancouver, British Columbia, Canada, North America

Mount Teide (Pico del Teide) from the east, Parque Nacional de Las Canadas del Teide (Teide National Park), Tenerife, Canary Islands, Spain, Europe

Uluru (Ayers Rock), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific

Sunset at Mount Everest (Mount Sagarmatha), Zhumulangma Peak, the world's highest mountain, 8,848 metres above sea level, Tibet, China, Asia

Giants Causeway, UNESCO World Heritage Site, County Antrim, Ulster, Northern Ireland, United Kingdom, Europe

The Olgas, Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific

Tourists on the balcony of the restaurant at Sunnegga looking at the Matterhorn in Switzerland, Europe

Eruption of Castle Geyser with thermophilic bacterica mats in foreground, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Hikers on walking trail below the Matterhorn mountain in the Swiss Alps near Zermatt, Valais, Switzerland, Europe

View of the Iguassu Falls, UNESCO World Heritage Site, from the Brazilian side, Brazil, South America