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

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

Paul Hobson / Badger (Meles meles) in garden at night, viewed through conservatory doors. Sheffield, England, UK. August.

Paul Hobson / Badger (Meles meles) in garden at night, viewed through conservatory doors. Cat looking on from inside. Sheffield, England, UK. August.

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

David Woodfall / Flooding outside house with debris in front of door during February 2014 floods, Upton upon Severn, Worcestershire, England, UK, 9th February 2014.

Pat Tuson / Vote Green Party poster on front gate, London Borough of Islington, England, UK

Pat Tuson / Old door in front of skip offered for recycling with a note saying Please Help Yourself, Highbury, London Borough of Islington, UK

Pat Tuson / Old door in front of skip offered for recycling with a note saying Please Help Yourself, Highbury, London Borough of Islington, UK

Eric Baccega / Traditional front door on Ouessant Island, Ile bretonne, Bretagne, France, June 2005

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

Gary K. Smith / Norfolk flint cottages with Hollyhocks, Mallow and Feverfew flowering in front of green doors, Norfolk, UK