Helsinki's shoreline during blue hour, Uusimaa, Finland (© Miemo Penttinen/Getty Images)

Colourful boats in Marsaxlokk Harbour, Malta (© Klubovy/Getty Images)

Florida burrowing owlet, Cape Coral, Florida, United States (© mlorenzphotography/Getty Images)

Decorated gate of the Royal Palace of Fez, Morocco (© cgst26/Shutterstock)

Migrating wildebeest crossing Mara River in Masai Mara, Kenya (© Manoj Shah/Getty Images)

Infinity Bridge in Stockton-on-Tees, England (© Bahadir Yeniceri/Shutterstock)

Jean-Marie Tjibaou Cultural Centre, New Caledonia (© Fabien Astre/Alamy)

Joshua Tree National Park, California, United States (© JJ Landscapes/Getty Images)

Colourful homes line Nyhavn Canal, Copenhagen, Denmark (© emicristea/Getty Images)

A group of elephants, Amboseli National Park, Kenya (© Ibrahim Suha Derbent/Getty Images)

Perseid meteors over Teide Observatory, Tenerife, Spain (© Westend61/Getty Images)

Aerial view of a wildlife crossing near Zakrzów, Poland (© bbsferrari/Getty Images)

The India Gate, New Delhi (© Arnav Pratap Singh/iStock/Getty Images)

Ruins of Ross Errilly Friary, County Galway, Ireland (© Maria Janus/Shutterstock)

Three false clownfish in a sea anemone, Cabilao Island, Bohol, Philippines (© Franco Banfi/Nature Picture Library)

Aerial view of Palmanova, a fortress city in Friuli, Italy (© Riccardo Saponi/Getty Images)

Whytecliff Park in West Vancouver, British Columbia, Canada (© Aolin Chen/Getty Images)

An orca surfaces in Lynn Canal near the Chilkat Mountains, Alaska, United States (© John Hyde/Alamy)

Winding road of Julier Pass, Switzerland (© Westend61/Getty Images)

Common blue butterfly, Devon, England (© Ross Hoddinott/Nature Picture Library)

Brown bear fishing in river, Katmai National Park, Alaska, United States (© Pal Hermansen/Nature Picture Library)

Brooklyn Bridge, New York City, United States (© shayes17/Getty Images)

Redwood National and State Parks, California, United States (© HadelProductions/Getty Images)

Auroras over Kirkjufell, Iceland (© Cavan Images/Alamy)

Lesser flamingo flock, Lake Magadi, Kenya (© Denis-Huot/Nature Picture Library)