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Water rich in blue-green algae (cyanobacteria), mineral salts and fine silica mud at the geothermal spa that owes its existence to the Svartsengi geothermal power plant, Blue Lagoon, near Reykjavik, Iceland, Polar Regions

Grand Canyon from the South Rim, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, USA, North America

Vineyards on hillsides on the north coast near Ribeira da Janela, island of Madeira, Portugal, Atlantic, Europe

Castlerigg Stone Circle (The Druid's Circle), Lake District National Park, Cumbria, England, UK, Europe

Remarkable Rocks, Coast Kangaroo Island, Flinders Chase N.P., Kangaroo Island, South Australia, Australia

Star tracing over Monument Valley, tracing stars moving round the North Star, Monument Valley, an area in Utah and Arizona, United States of America (U.S.A.), North America

Rock formation known as Swirls on Colorado Plateau, Arizona, United States of America (U.S.A.), North America

Sandstone wave, Paria Canyon, Vermillion Cliffs Wilderness, Arizona, United States of America (U.S.A.), North America

Sandstone wave, Paria Canyon, Vermillion Cliffs Wilderness, Arizona, United States of America (U.S.A.), North America

Turret Arch through North Window at sunrise, Arches National Park, Moab, Utah, United States of America (U.S.A.), North America

Footbridge, White Cloud scenic area, Huang Shan (Yellow Mountain), UNESCO World Heritage Site, Anhui Province, China, Asia

Walking Fairyland Bridge, White Cloud scenic area, Huang Shan (Yellow Mountain), UNESCO World Heritage Site, Anhui Province, China, Asia

Silhouette of pine tree, White Cloud scenic area, Huang Shan (Mount Huangshan) (Yellow Mountain), UNESCO World Heritage Site, Anhui Province, China, Asia

Rock carved granite image of the 7m tall standing Buddha, Gal Vihara, Polonnaruwa (Polonnaruva), UNESCO World Heritage Site, Sri Lanka, Asia

The Talati de Dalt, prehistoric, neolithic remains of Talayotic culture, Menorca (Minorca), Balearic Islands, Spain, Mediterranean, Europe

Sarakiniko volcanic rock formations at sunset, island of Milos, Cyclades, Greek Islands, Greece, Europe

Lower Aysgarth Falls near Hawes, Wensleydale, Yorkshire Dales National Park, Yorkshire, England, United Kingdom, Europe

Dawn view over North Sea from beach at Marsden Bay, showing natural rock arch in Marsden Rock, South Shields, Tyne and Wear, England, United Kingdom, Europe

Rock strata in cliffs in Paria River Valley, Grand Staircase-Escalante National Monument, near Page, Arizona, United States of America, North America

Hexagonal basalt columns of the Giant's Causeway, UNESCO World Heritage Site, and Area of Special Scientific Interest, near Bushmills, County Antrim, Ulster, Northern Ireland, United Kingdom, Europe

Phallic pillars known as fairy chimneys in the valley known as Love Valley near Goreme in Cappadocia, Anatolia, Turkey, Asia Minor, Eurasia

Phallic pillars known as fairy chimneys in the valley known as Love Valley near Goreme in Cappadocia, Anatolia, Turkey, Asia Minor, Eurasia

Tennyson Down, Black Rock and Highdown Cliffs from Freshwater Bay, Isle of Wight, England, United Kingdom, Europe

Rock formations (flysch) at low tide on coast between Zumaia and Deba, Costa Vasca, Basque country, Euskadi, Spain, Europe

Mount Hayden from Point Imperial, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Point Sublime, North Rim, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Karst limestone rock formations at Zhangjiajie Forest Park, Wulingyuan Scenic Area, UNESCO World Heritage Site, Hunan Province, China, Asia

The light of the setting sun illuminates the unusual architecture of Blackchurch Rock, which lies under cliffs between Clovelly and Hartland Point, Culm Coast, North Devon, England, United Kingdom, Europe

The light of the setting sun illuminates the unusual architecture of Blackchurch Rock, which lies under cliffs between Clovelly and Hartland Point, Culm Coast, North Devon, England, United Kingdom, Europe

Lanyon Quoit burial chamber, Madron, near Penzance, Lands End, Cornwall, England, United Kingdom, Europe

Lanyon Quoit burial chamber, Madron, near Penzance, Lands End, Cornwall, England, United Kingdom, Europe

November 13, 2007 - Moeraki Boulders, round septarian concretions created by cementation of Paleocene mudstone of the Moeraki formation, Koekohe Beach, New Zealand.

November 13, 2007 - Moeraki Boulders, spherical septarian concretions created by cementation of Paleocene mudstone of the Moeraki formation, Koekohe Beach, New Zealand.

November 13, 2007 - Moeraki Boulders, spherical septarian concretions created by cementation of Paleocene mudstone of the Moeraki formation, Koekohe Beach, New Zealand.

View above Red Wall Bridge crossing Roaring Springs Canyon, North Kaibab Trail, Grand Canyon North Rim, UNESCO, Arizona, United States of America

Red Wall Bridge crossing Roaring Springs Canyon on North Kaibab Trail, Grand Canyon North Rim, UNESCO, Arizona, United States of America

Ruined Castle (Cromwell's Barracks), used by pirates Don Bosco and Grace O'Malley, Inishbofin Island, Connemara, County Galway, Connacht, Republic of Ireland

View of Unfinished Obelisk in Aswan quarry on a sunny day, Aswan, Nubia, Egypt, North Africa, Africa

The Needles, incredible Canyon landscape, Canyonlands National Park, Utah, United States of America, North America

Drone aerial view of Meteora and ancient holy Monastery of Varlaam and Great Meteoron, UNESCO, Kalabaka, Greece

The south entrance of the historic Johnson Canyon Railroad Tunnel, Kaibab National Forest of Arizona, USA

Aerial of tombs carved in sandstone rock of Jabal Banat (Qasr al-Bint), Hegra (Madain Salih), UNESCO, AlUla area, Medina Province, Saudi Arabia

Woman in a niqab at Face Rock, a sandstone rock formation in shape of human head profile, Hegra, UNESCO, AlUla, Medina Province, Saudi Arabia

Ancient stone carvings of arhats, Bodhisattvas and Buddhas on hillside of Feilaifeng (Flying Peak), Lingyin Temple, Hangzhou, Zhejiang Province, China

Former Mine Working Slate Cavern Tunnel at Dinorwig Quarry (Dinorwic Quarry), Eryri (Snowdonia National Park), North Wales, United Kingdom