Fern Stems, England

Window shutters, Bastide d'Armagnac, France

Place de la Concorde ferris wheel, La Grande Roue, Central Paris, France

Sydney city skyline with Circular Quay, Sydney, New South Wales, Australia, Pacific

Hobbiton, wooden doors of Hobbit holes in the film set fictional village of Hobbiton, Matamata, North Island, New Zealand, Pacific

Hobbiton, wooden doors of Hobbit holes in the film set fictional village of Hobbiton, Matamata, North Island, New Zealand, Pacific

The semi-circular balcony of the Kornhaus restaurant, designed by Carl Feiger of the Bauhaus, in Dessau, Saxony Anhalt, Germany, Europe

Cenotaph Hall, Voortrekker Monument, Pretoria, South Africa, Africa

Person enjoying the open-air cold baths in the circular pool of the Arctic Bath Spa Hotel, Harads, Lapland, Sweden

Circular staircase with the statue Ugolino and His Son by Jean-Baptiste Carpeaux, Petit Palais, Paris, France, Europe

Straw bales, Swinbrook, Cotswolds, United Kingdom

Place de la Concorde ferris wheel, La Grande Roue, Central Paris, France

Beehive houses built of brick and mud, Srouj village, Syria, Middle East

Dassanech woman standing outside her hut, village near Omorate, Ethiopia, Africa

Straw bales in the Cotswolds at Swinbrook in Oxfordshire, United Kingdom

Houses in the town of Karima, Sudan, Africa

Straw bales below a stormy sky, Swinbrook, the Cotswolds, United Kingdom

Sydney Opera House built in 1973, designed by Jorn Utzon, probably the most iconic symbol of the city, with a tourist ferry crossing the harbour towards nearby Circular Quay, Sydney, New South Wales, Australia, Pacific

Modern architecture at the BMW Headquarters office blocks in Munich, Bavaria, Germany

Window shutters, Labastide d'Armagnac, France

Circular stained glass window in The Cathedral of Notre Dame, Our Lady, at Strasbourg, Alsace, France

Modern architecture at the BMW Headquarters office blocks in Munich, Bavaria, Germany

Circular building with houses in the background at the Hancock Shaker Village, in Massachusetts, New England, United States of America, North America

Circular Quay, Sydney, New South Wales, Australia, Pacific

Opera Bar and Circular Quay at night, Syndey, New South Wales, Australia, Pacific

Sydney Cove and Circular Quay, Sydney, New South Wales, Australia, Pacific

Stacked strawbales, The Cotswolds, Oxfordshire, United Kingdom

Monopteros at the English Garden in Munich, Upper Bavaria, Bavaria, Germany, Europe

Large circular aerial at RAF Chicksands, a communications centre operated by the U.S. Air Force, near Shefford, Bedfordshire, England, United Kingdom, Europe

Circular Quay, Sydney, New South Wales, Australia, Pacific

Doughnut bench, Luxembourg City, Luxembourg, Europe

Sunrise on the old tower seen from colonnade of the semi-circular portico, Plaza de Espana, Seville, Andalusia, Spain, Europe

Outdoor cafe, Circular Quay, Sydney, New South Wales, Australia, Pacific

Route 66 Round Barn, Arcadia, Oklahoma, United States of America, North America

Painted houses of the Alaba peoples near Kulito, Rift Valley, Ethiopia, Africa

Circular Quay, Sydney, New South Wales, Australia, Pacific

Sydney Opera House built in 1973, designed by Jorn Utzon, at Circular Quay, viewed at sunset, Sydney, New South Wales, Australia, Pacific

Circular Quay, Sydney, New South Wales, Australia, Pacific

Route 66 Round Barn, Arcadia, Oklahoma, United States of America, North America

Hakka Tulou round earth buildings, UNESCO World Heritage Site, Fujian Province, China, Asia

Circular Quay, Sydney, New South Wales, Australia, Pacific

Fahan beehive hut, Slea Head, County Kerry, Munster, Republic of Ireland, Europe

A boulder of millstone grit on Ilkley moor with a perfect circular hole probably formed by a large inclusion weathered out of the bedrock, West Yorkshire, England, United Kingdom, Europe

A boulder of millstone grit on Ilkley moor with a perfect circular hole probably formed by a large inclusion weathered out of the bedrock, West Yorkshire, England, United Kingdom, Europe

Museum of Contemporary Art, Circular Quay, Sydney, New South Wales, Australia, Pacific

A boulder of millstone grit on Ilkley moor with a perfect circular hole probably formed by a large inclusion weathered out of the bedrock, West Yorkshire, England, United Kingdom, Europe

Circular Quay, Sydney, New South Wales, Australia, Pacific

Hay bales in a field on a farm, South Downs, Sussex, England, United Kingdom, Europe

Circular Quay, Sydney, New South Wales, Australia, Pacific

Circular Quay, Sydney, New South Wales, Australia, Pacific

Museum of Contemporary Art, Circular Quay, Sydney, New South Wales, Australia, Pacific

The tholos, a circular building created between 380 and 360 BC at the centre of the sanctuary of Athena Pronaia, Delphi, UNESCO World Heritage Site, Peloponnese, Greece, Europe

Circular Quay, Sydney, New South Wales, Australia, Pacific

Usa, South West, Arizona, Sonora Desert, Cactus

View of the city from Circular Quay, Sydney, New South Wales, Australia, Pacific

Sunset over the Lake District fells with a circular rainbow, Cumbria, England, United Kingdom, Europe

The famous Men an Tol stone near St. Just, a late Neolithic monument in Cornwall, England, United Kingdom, Europe

webs: between alder branches early morning talsu rajons, latvia

The famous Men an Tol stone near St. Just, a late Neolithic monument in Cornwall, England, United Kingdom, Europe

Water flowing into a bowl

Blue Button (Porpita porpita), Jellyfish with clear cound, blue disc with tentacles extended, Cayman Brac rockpool, Cayman Islands, Caribbean

Chinstrap penguin (Pygoscelis antarctica) chick head detail at colony on Useful Island near the Antarctic Peninsula. There are an estimated 2 million breeding pairs of chinstrap penguins in the Antarctic peninsula region alone, perhaps as many as 7.5 million breeding pairs in all of Antarctica. Their name derives from the narrow black band under their heads which makes it appear as if they are wearing black helmets, making them one of the most easily identified types of penguin. Other names for them are "Ringed Penguins", "Bearded Penguins", and "Stonecracker Penguins" due to their harsh call. They grow to 68 cm (27 in). The average adult weight of a Chinstrap Penguin is 4.5 kg (10 lbs). Weight can range from 3 to 6 kg (6.6-13.2 lbs), with males being slightly larger and weight varying based on where the penguin is in the breeding cycle. Their diet consists of krill, shrimp, and fish. On land they build circular nests from stones, and lay two eggs, which are incubated by both the male and the female for shifts of five to ten days. They can also breed on icebergs, though they prefer non-icy conditions. The chicks hatch after about 35 days, and have fluffy gray backs and white fronts. The chicks stay in the nest for 20?30 days before they go to join a creche. At around 50?60 days old, they moult, gaining their adult plumage and go to sea. The Chinstrap Penguin was first described by German naturalist Forster in 1781. Its specific epithet was often seen as antarctica, however a 2002 review determined the genus Pygoscelis was masculine, and hence the correct binomial name is Pygoscelis antarcticus.

Oceanopolis, Brest, Britanny, France, EU (rr)

Sara Campbell world Champion freediver running freediving courses in Dahab. Egypt.

Whooper Swan (Cygnus cygnus) on an early morning flight, slow shutter speed capturing a circular flight around the valley floor. Shot shows valley walls in the background , Scotland

Coconut or Margined Octopus (Octopus marginatus) hiding in Paint Can. This animal often hides in the husk of coconut, and also in 1/2 shells (like clams) when young. Lembeh Strait, Sulawesi, Indonesia. (rr)

Circular Batfish (Platax orbicularis). Red Sea.

Circular Spadefish/Batfish (Platax orbicularis) Shoal. Barracuda Point, Sipadan Island, Borneo, Malaysia (RR)

Jellyfish in Neiafu Harbour, Vava'u Tonga in the South Pacific. shot with a fisheye lens

Sperm whale juvenile shot with a fisheye n the Azores Portugal

Humpback female and her calf Vava'u Tonga in the South Pacific, shot with a fisheye lens

Arctic pack ice, Spitsbergen Norway, Arctic Ocean through a fisheye lens

New born baby humpback whale calf, white in colour, curious and playful. Vava'u Tonga South Pacific

Straw bales in a field in Kelling, Norfolk, England, United Kingdom, Europe

Circular Spadefish/Batfish (Platax orbicularis) Shoal. Barracuda Point, Sipadan Island, Borneo, Malaysia. (RR)

The Bodmin Cross, an ancient stone cross near Bodmin, Cornwall, England, United Kingdom, Europe

Tube Anemone (Currently unidentified). Gorontalo, Sulawesi, Indonesia

The Tate Gallery in St. Ives, Cornwall, England, United Kingdom, Europe

Unidentified sponge, Rongelap, Marshall Islands, Micronesia, Pacific

A capsule on the London Eye on the Thames South Bank, London, England, United Kingdom, Europe

The famous Men an Tol stone near St. Just, a late Neolithic monument in Cornwall, England, United Kingdom, Europe

A business man at work at Regus in London, England, United Kingdom, Europe

A capsule on the London Eye on the Thames South Bank, London, England, United Kingdom, Europe

The famous Men an Tol stone near St. Just, a late Neolithic monument in Cornwall, England, United Kingdom, Europe

The famous Men an Tol stone near St. Just, a late Neolithic monument in Cornwall, England, United Kingdom, Europe

Water flowing into a bowl

A Christmas wreath on a house front door, England, United Kingdom, Europe

Rain drops on the sea in Southeast Alaska, USA. Pacific Ocean.

Short finned pilot whale (Globicephala macrorynchus). A very young pilot whale showing the foetal folds. Ripples on the surface have created a circular pattern of stripes too. Gulf of California.

A capsule on the London Eye on the Thames South Bank, London, England, United Kingdom, Europe

The Lindblad Expedition ship National Geographic Explorer transits Lemaire Channel in late evening light on the west side of the Antarctic peninsula in Antarctica

Young boy playing with boogie board on beach

A business man at work at Regus in London, England, United Kingdom, Europe

The London Eye on the Thames South Bank UK with a black headed gull flying past, London, England, United Kingdom, Europe

The famous Men an Tol stone near St. Just, a late Neolithic monument in Cornwall, England, United Kingdom, Europe

The Lindblad Expedition ship National Geographic Explorer transits Lemaire Channel in late evening light on the west side of the Antarctic peninsula in Antarctica

A capsule on the London Eye on the Thames South Bank, London, England, United Kingdom, Europe

A frozen tarn on Glaramara in the Lake District, Cumbria, England, United Kingdom, Europe

The London Eye on the Thames South Bank, London, England, United Kingdom, Europe

The London Eye on the Thames South Bank UK with a black headed gull flying past, London, England, United Kingdom, Europe