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Through the Bocche di Vulcano, facing the crater on Vulcano, Aeolian Islands, UNESCO World Heritage Site, island of Sicily, Italy, Mediterranean, Europe
Sof Omar cave, downstream maze, daylight in through multiple entrances, Southern Highlands, Ethiopia, Africa
Giants Causeway, UNESCO World Heritage Site, County Antrim, Ulster, Northern Ireland, United Kingdom, Europe
Rock formation on the Nambe Chimayo road, Santa Fe, New Mexico, United States of America (U.S.A.), North America
Castlerigg Stone Circle (the Druid's Circle), Lake District National Park, Cumbria, England, UK, Europe
Red rock formations of Morro Branco on the Ceara coastline, near Canoa Quedrada, Ceara', Brazil, South America
Old Man of Hoy, sandstone sea stack 137m high, with ferry in background, Hoy, Orkney Islands, Scotland, United Kingdom, Europe
Hot air balloons flying among rock formations at sunrise in the Red Valley, Goreme National Park, UNESCO World Heritage Site, Cappadocia, Anatolia, Turkey, Asia Minor, Eurasia
Rock formations on the volcanic coastline on the island of Graciosa in the Azores, Portugal, Atlantic, Europe
Tufa towers at Lac Abhe (Abbe), formed by hot springs beneath old lake at higher level, Afar Triangle, Djibouti, Africa
People canoeing near Tham Law (tube cove), Ao Phang-Nga Marine Park, Phang Nga province, Thailand, Southeast Asia, Asia
The rocky islet of Es Vedra surrounded by mist, with pine trees in foreground, near Sant Antoni, Ibiza, Balearic Islands, Spain, Mediterranean, Europe
Lake of the Clouds, Carlsbad Caverns National Park, UNESCO World Heritage Site, New Mexico, United States of America, North America
Erosion helps form stunning formations in the rocks of the Coloured Canyon, Sinai South, Egypt, North Africa, Africa
Rock formations caused by erosion in a desert landscape in Monument Valley, Arizona, United States of America, North America
Hot air balloon flight over the famous volcanic tufa rock formations around Goreme, Cappadocia, Anatolia, Turkey, Asia Minor, Eurasia
A snorkeler explores the fresh water grotto formations at Makatea, Tuamotus, French Polynesia, South Pacific, Pacific
Rocky amphitheatre with pool, at head of Cathedral Gorge, Purnululu National Park, UNESCO World Heritage site, Bungle Bungle, Kimberley, Western Australia, Australia, Pacific
Aerial view of beach and rock formations, Sarakiniko, Milos, Cyclades Islands, Greek Islands, Greece, Europe
Uluru (Ayers Rock), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
Hot air balloons flying among rock formations at sunrise in the Red Valley, Goreme National Park, UNESCO World Heritage Site, Cappadocia, Anatolia, Turkey, Asia Minor, Eurasia
Rock formations caused by erosion and known as North Window Arch, Arches National Park, Utah, United States of America, North America
Les aiguilles de Port Coton (Port Coton needles), Belle Ile en Mer, Breton Islands, Morbihan, Brittany, France, Europe
Hot air balloons flying among rock formations at sunrise in the Red Valley, Goreme National Park, UNESCO World Heritage Site, Cappadocia, Anatolia, Turkey, Asia Minor, Eurasia
View from Ublrr Rock, aboriginal rock art site, part of the sandstone escarpment on park border, Kakadu National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
Les aiguilles de Port Coton (Port Coton needles), Belle Ile en Mer, Breton Islands, Morbihan, Brittany, France, Europe
Kilauea volcano crater showing solidified ropy lava called pahoehoe, The Big Island, Hawaii, Hawaiian Islands, United States of America, North America
Erosion with volcanic tuff pillars, Pasabagi near Goreme, Cappadocia, Anatolia, Turkey, Asia Minor, Asia
Erosion with volcanic tuff pillars, Pasabagi, near Goreme, Cappadocia, Anatolia, Turkey, Asia Minor, Asia
Tourists cross flood scoured rocks, past typical formations, Purnululu National Park, UNESCO World Heritage Site, Bungle Bungle, Kimberley, Western Australia, Australia, Pacific
Hot water in pools on calcite terraces deposited by Mammoth Hot Springs, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America
A snorkeler explores the fresh water grotto formations at Makatea, Tuamotus, French Polynesia, South Pacific, Pacific
Tourists on viewing platform, Punakaiki, Pancake Rocks and blowholes, Paparoa National Park, Westland, South Island, New Zealand, Pacific
Volcanic rock formations on south eastern coast, near Kleftiko, Milos, Cyclades islands, Greece, Mediterranean, Europe
Hoodoos, Bryce amphitheater, Bryce Canyon National Park, Utah, United States of America (U.S.A.), North America
Rock formation called The Finger of Allah, Akakus, Sahara desert, Fezzan, Libya, North Africa, Africa
Erosion with volcanic tuff pillars. Pasabagi, near Goreme, Cappadocia, Anatolia, Turkey, Asia Minor, Asia
Hot air balloons flying among rock formations at sunrise in the Red Valley, Goreme National Park, UNESCO World Heritage Site, Cappadocia, Anatolia, Turkey, Asia Minor, Eurasia