Donkey cart in Kalahari, at entrance to Kgalagadi Transfrontier Park, gate and border post between Northern Cape, South Africa and Botswana, Africa

A Border Collie dog amongst Bluebells above Austwick, Yorkshire Dales, UK.

A Border Collie dog amongst Bluebells above Austwick, Yorkshire Dales, UK.

Chinese woman using a bow and arrow at the Jiayuguan Fortress with two gatehouses at the western end of the Great Wall of China, Silk Road, Gansu, China, Asia

Jiayuguan fortress with two gatehouses at the western end of the Great Wall, Silk Road, Gansu, China, Asia

Jiayuguan fortress with gatehouse at the western end of the Great Wall, Silk Road, Gansu, China, Asia

Bastions proctecting the Portas de Olivenca. Fort Santa Luzia, the greatest preserved fortification of the 17th century worldwide. Elvas in the Alentejo close to the spanish border. Elvas is listed as UNESCO world heritage. Europe, Southern Europe, Portugal, March

Forte de Graca. Elvas in the Alentejo close to the spanish border. Elvas including Forte de Graca is listed as UNESCO world heritage. Europe, Southern Europe, Portugal, April