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

Tim Fitzharris / Fortress Mountain, Kannaskis Country, Alberta, Canada

Kirkendall-Spring / Castle / Chateau d'Angers fortress and gardens, Angers, France, Europe

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

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

Guy Edwardes / Harlech Castle, Gwynedd, Wales, UK, August 2005.

Guy Edwardes / Harlech Castle, Gwynedd, Wales, UK, December 2008.

Ashley Cooper / La Calahorra Castle in La Calahorra at the foot of the Sierra Nevada mountains in Andalucia, Spain,

Ashley Cooper / La Calahorra Castle in La Calahorra with spring flowers, at the foot of the Sierra Nevada mountains in Andalucia, Spain.

Eladio Fernandez / Guide leading visitor's horse up to La Citadelle fortress, UNESCO World Heritage Site, Haiti. August 2016.