Castelbouc and the Gorges du Tarn along the Tarn River in France (© Stefan Schurr/Westend61/Offset)

Fishermen Monument at L'Etang du Nord, Magdalen Islands, Que. (© Christian Goupi/Alamy Stock Photo)

Guaita Tower in San Marino (© Piercarlo Abate/Shutterstock)

'Vessel' at Hudson Yards in New York City (© Paparacy/Shutterstock)

Toronto sign in Nathan Phillips Square by the City Hall, Toronto (© Jon Arnold/Danita Delimont)

Castillo del Morro in Old San Juan, Puerto Rico (© grandriver/Getty Images)

Mount Fanjing, the highest peak of the Wuling Mountains, in southwest China (© Keitma/Alamy)

Southern yellow-billed hornbills in Kruger National Park, South Africa (© Ben Cranke/Getty Image)

Tegallalang terrace farms in Ubud, Bali, Indonesia (© gorgeoussab/Shutterstock)

Gerenuk in Tsavo National Park, Kenya (© Byrdyak/iStock/Getty Images Plus)

Aerial view of rainforest and Daintree River, Australia (© Peter Adams/Offset)

【今日中秋】 (© VCG/VCG via Getty Images)

Walruses near Kvitøya in the Svalbard archipelago, Norway (© Ole Jorgen Liodden/Minden Pictures)

Surfboards in a row (© plainpicture/Tony Arruza)

Aerial view of trees growing in a forest, Vancouver (© Michael Wu/EyeEm/Getty Images)

Stoke Pero Common, Exmoor National Park, England (© David Noton/Alamy)

The Villarrica volcano in Chile on September 2, 2018 (© Cristobal Saavedra Escobar/Reuters)

San Sebastián und der Kursaal, in dem das Filmfestival San Sebastián stattfindet (© Aljndr/iStock/Getty Images Plus)

Gewurztraminer grapes on vine at autumn harvest in Okanagan Valley, B.C. (© Henry Georgi/Age Fotostock)

'The Wall for Peace' and the Eiffel Tower in Paris for the International Day of Peace (© Prisma by Dukas Presseagentur GmbH/Alamy)

Fireworks during La Merce Festival in Barcelona, Spain (© Lucas Vallecillos/age fotostock)

Equinox at the Temple of Kukulcan in Chichen Itza, Mexico (© Somatuscani/Getty Images Plus)

A mountain gorilla eating in a tree in the Bwindi Impenetrable National Park, Uganda (© Robert Haasmann/Minden Pictures)

Arctic surfing trip in the Lofoten Islands, Norway for the Lofoten Masters (© Nicolás Pina/Tandem Stills + Motion)

The Pando quaking aspen in Fishlake National Forest, Utah (© Don Paulson/Danita Delimont)

Colourful sunset over Castildetierra, in the Natural Park of Bardenas Reales, Navarre, Spain (© Inigofotografia/iStock/Getty Images Plus)

Blooming jacaranda trees in New Farm Park, Brisbane, Australia (© Walter Bibikow/Danita Delimont)

Autumnal landscape near the town of Clavijo in Spain's Rioja district (© Olimpio Fantuz/eStock Photo)

An aerial view of Daxing International Airport in Beijing (© Xinhua/Alamy)