Dave Bevan / Slow motion clip of a Swallow (Hirundo rustica) flying into a barn in heavy rain, Carmarthenshire, Wales, UK, September.

Kirkendall-Spring / Doorway of the poet Dilgo Khyentse Rinpoche's house, near Paro, Bhutan, October 2014.

Eric Medard / Barn owl (Tyto alba) flying through barn door at night, taken with infra red remote camera trap, Mayenne, Pays de Loire, France, November.

TJ Rich / Young springer spaniel sitting on doorstep. Wiltshire, England, UK.

Juan Carlos Munoz / House built during period of Catalan Modernism, Olot, La Garrotxa Natural Park, Girona, Catalonia, Spain. 2019.

Juan Carlos Munoz / House built in Catalan Modernist style, Olot, La Garrotxa Natural Park, Girona, Catalonia, Spain. 2019.

Olga Kamenskaya / View through door of people talking, whilst on diving expedition. Upper reaches of the Lena River Baikalo-Lensky Reserve, Siberia, Russia. August 2018.

Matthew Maran / Red fox (Vulpes Vulpes) silhouetted in door to a house, North London, England, UK. June.

Enrique Lopez-Tapia / Old door of Rumtek, a Kagyu monastery near Gangtok in Sikkim. It is the largest monastery in Sikkim. India, October 2018.

Dave Bevan / Common wasp (Vespula vulgaris) collecting wood pulp from a wooden shed, Worcestershire, England, UK, July.

Juan Carlos Munoz / Door at Malla's Royal Palace, Bhaktapur Durbar Square Complex, Durbar Marg, Lalitpur Metropolitan City, Kathmandu Valley, Nepal. February 2018.

Staffan Widstrand / Wild Wonders of China / Decorated door entrance to a building at Lower Yubeng village, Meili Snow Mountain National park, Yunnan, China, October 2017.

Ashley Cooper / Navala village in the Fijian highlands, the only village left on the island still composed entirely of traditional Bure houses, Fiji, March 2007.

Ashley Cooper / Navala village in the Fijian highlands, the only village left on the island still composed entirely of traditional Bure houses, Fiji, March 2007.

Dave Bevan / Slow motion clip of two Swallows (Hirundo rustica) flying out of a barn in heavy rain, Carmarthenshire, Wales, UK, September.

Mark MacEwen / Green door in the Blue City, Jodhpur, Rajasthan, India. March 2015

Mark MacEwen / Door in the Blue City, Jodhpur, Rajasthan, India. March 2015

Mark MacEwen / Door in Mehrangarh Fort, located in Jodhpur, Rajasthan, India. March 2015

Mark MacEwen / Door in the Blue City, Jodhpur, Rajasthan, India. March 2015

Mark MacEwen / Green door in the Blue City, Jodhpur, Rajasthan, India. March 2015

Mark MacEwen / Door in the Blue City, Jodhpur, Rajasthan, India. March 2015

Mark MacEwen / Yellow door in the Blue City, Jodhpur, Rajasthan, India. March 2015

Mark MacEwen / Green Door in the Blue City, Jodhpur, Rajasthan, India. March 2015

Constantinos Petrinos / Bougainvillea flowers growing on the wall of a house, Spetses Island, Aegean Sea, Greece. April 2013.

Luke Massey / Tree growing up between a door and its frame in the Chernobyl Exlusion Zone, Ukraine September

Enrique Lopez-Tapia / Centuries-old wooden door, Lalibela Churches Complex. UNESCO World Heritage Site. Ethiopia, December 2014.

Juergen Freund / Toilet door with alien mural at Wycliffe Well UFO capital of Australia along the Stuart Highway,Northern Territory, Australia.

Pascal Tordeux / Stone building with wooden doors, typical of the area. Queyras, Hautes-Alpes, France, October 2014.

Kirkendall-Spring / Young girl looking out of a doorway, Paro River Valley. Bhutan, October 2014.

Pete Oxford / Tabby house, Cannon's Point, St Simon's Island, Barrier Islands, Georgia, USA.

Iris Thorsteinsdottir / Siberian forest cat (Felis catus) grey, ginger and white female kitten age 7 Months sitting by door. Clifton, Bristol, UK.

David Noton / Blue doorway with Grape vines (Vitis) Puyloubier, Var, Provence, France, October 2012.

David Noton / Blue doorway with Grape vines (Vitis) Puyloubier, Var, Provence, France, October 2012.

David Tipling / Barn Owl (Tyto alba) peering from barn door, Kent, UK.

Steve O. Taylor (GHF) / Ritual carving on Dogon door, Bandiagara, Mali, 2005-2006.

Loic Poidevin / Locked yellow door, Santorin Island, Greece, May 2009.

Loic Poidevin / Locked blue door, Santorin Island, Greece, May 2009.

Loic Poidevin / Blue door, Santorin Island, Greece.

Wild Wonders of Europe / Widstrand / A simple wildlife watching hide to view red deer, near Stepnica, Oder delta, Poland, February 2014.

David Woodfall / Bike and sandbags in February 2014 flood, Surrey, England, UK, 16th February 2014.

Stephen Dalton / Front door, entrance to house, with standard flowering tree in pot, England, UK

Mark Moffett / Door-maker Ant (Stenamma alas) using mud ball to close entrance to nest, Rio Toachi, Ecuador. Sequence 3 of 3

Mark Moffett / Door-maker Ant (Stenamma alas) at nest entrance with mud ball used as a door nearby, Rio Toachi, Ecuador. Sequence 1 of 3

Mark Moffett / Door-maker Ant (Stenamma alas) closing nest entrance with mud ball used as a door nearby, Rio Toachi, Ecuador. Sequence 2 of 3

Mark Moffett / Door-maker Ant (Stenamma alas) at nest entrance with mud ball used as a door nearby, Rio Toachi, Ecuador

Frank Tomlinson / Detail in entrance door of Charles V Palace, The Alhambra, Granada, Spain

Frank Tomlinson / Entrance to Convento de las Ursulas (c1512) Salamanca, Spain

Onne van der Wal / Model of a ship above a door entrance in Nelson's Dockyard, Antigua, Caribbean.

Yashpal Rathore / Tiger (Panthera tigris) female, walking through carved door entrance gate of ruins of Bandhavgarh Fort at night, Bandhavgarh Tiger Reserve, Madhya Pradesh, India. Endangered. Camera trap.

Will Watson / Romanesque carving on south doorway of St Mary & St David Church featuring a a man's head spouting foliage (Green Man symbol), Kilpeck, Herefordshire, England, UK, October 2015. Carved by Herefor...

Kristel Richard / Amazona / woman riding sidesaddle in traditional costume on Lusitano Varga stallion, Feira da Golega, Ribatejo, Portugal. Amazonas are side-saddle riders.

Jean E. Roche / House built out of Larch (Larix decidua) with doorframe decorated with Stemless carline thistle (Carlina acaulis) flowerheads. Provence-Alpes-Cotes-d'Azur, France. July.

Stephen Dalton / African grey parrot (Psittacus erithacus) landing on kitchen door. Captive.

Milan Radisics / Female Red fox (Vulpes vulpes) leaving backyard through a traditional wooden door at night, Hungary. January.

Ernie Janes / * Swarm of Crane fly (Tipulidae) resting on white wall and door, UK. October.

Bruce Thomson / Trapdoor spider (Misgolus sp.) in burrow entrance, burrow camouflaged under tree roots in rainforest, Bunya Pine Mountains, Queensland, Australia.

Inaki Relanzon / Common wall gecko (Tarentola mauritanica), on door, Catalonia, Spain.

Inaki Relanzon / Common wall gecko (Tarentola mauritanica), on door, Catalonia, Spain.

Phil Savoie / Fairy door with Christmas wreath in tree trunk, Wales, UK.

Karine Aigner / A white cat peeks out a blue door. Chefchaouen, Morocco.

Terry Whittaker / Woman standing outside shop. Central Madagascar. 2019.