Guy Edwardes / Dawn mist around Hambledon Hill from Bullbarrow Hill, Cranbourne Chase, Dorset, England, UK. February 2016.

Gavin Hellier / Timelapse from day to night looking towards the Peter and Paul Fortress, St, Petersburg, Russia, May 2016. Hellier

Ernie Janes / Abstract photo of Tower Bridge, with blurred motion red bus, London, June 2013. Digitally manipulated.

Shattil & Rozinski,Shattil & Rozinski / Mule deer (Odocoileus hemionus), with the Denver skyline and Rocky Mountains in the background, Denver, Colorado, USA, November.

Michael Pitts / Eastern Island showing the WW2 airstrip which was used to launch the initial attack on the Japanese fleet for the Battle of Midway, Midway, Central Pacific.

Christophe Courteau / Stars Trails around the North Star, above sea and National Fort, Saint-Malo, Brittany, France.

Yashpal Rathore / Bengal Tiger (Panthera tigris), walking through ancient arch of fort, Ranthambore National Park, India

Mike Read / Rain clouds over Ruthven Barracks. Near Insh Marshes RSPB reserve, Badenoch and Strathspey, Highlands, Scotland, UK. October 2018.

Juan Carlos Munoz / Dun Aonghasa / Fort of Aongus hill fort. Inishmore, Aran Islands, County Galway, Republic of Ireland. May 2011.

Eladio Fernandez / View from one of the fortresses windows into the backyard where all the cannon and mortar balls are stored. La Citadelle, UNESCO World Heritage Site, Haiti, August 2016.

Axel Gomille / Ranthambhore Fort with resthouse Jogi Mahal below, Ranthambhore National Park, Rajasthan, India

Nick Upton / Ancient stone staircase with 913 steps zigzagging up to Palamidi Castle, a Venetian fortress on a hill overlooking Nafplio and the Argolic Gulf, Argolis, Peloponnese, Greece, July.