Polar bear at the edge of Hudson Bay, Manitoba, Canada (© Sean Crane/Minden Pictures)

Sea angel (© Alexander Semenov Images/Shutterstock)

Stormy sky over Lake Geneva in Lausanne, Switzerland (© Suradech Singhanat/Shutterstock)

Bridge of Sighs in Venice, Italy (© Doug Pearson/Alamy)

Brocken spectre in Central Balkan National Park, Bulgaria (© Maya Karkalicheva/Getty Images)

Orcus sculpture in the Gardens of Bomarzo in Bomarzo, Italy (© Scott Wilson/Alamy)

Oil lamps arranged on a rangoli to celebrate Diwali in Guwahati, India (© Biju Boro/Getty Images)

Mute swan in Valkenhorst Nature Reserve, near Valkenswaard, the Netherlands (© David Pattyn/Minden Pictures)

Karst mountains in Guilin and Lijiang River National Park, China (© Sean Pavone/Alamy)

Cypress trees in autumn, Georgia (© Chris Moore/Tandem Stills + Motion)