Sand dunes with Sangre de Cristo Mountains in the background, Great Sand Dunes National Park and Preserve, Colorado, USA (© Tim Fitzharris/Minden Pictures)

Smith Rock State Park, Oregon, USA (© Manuela Durson/Getty Images)

Lujiazui Financial District, Shanghai, China (© Jackal Pan/Getty Images)

A bull stands in a field under the gaze of Mount Pico, Pico Island, Azores (© Atmo-Sphere/Getty Images)

Beaver dam in the Sawtooth National Forest, Idaho, USA (© Charles Knowles/Alamy)

Beaver dam in the Sawtooth National Forest, Idaho (© Charles Knowles/Alamy)

Huay Mae Khamin waterfall in Khuean Srinagarindra National Park, Thailand (© ImpaKPro/Getty Images)

Valletta, Malta (© Deejpilot/GettyImages)

A bearded reedling in Elmley National Nature Reserve in Kent, England (© Mark Bridger/Offset by Shutterstock)

Franklin-Gordon Wild Rivers National Park, Tasmania (© Heeb Photos/eStock Photo)

Toronto skyline at sunset, Canada (© diegograndi/Getty Images)

Rocamadour, France (© Rrrainbow/Getty Images)

Ruby-throated hummingbird feeding on yellow bells in the Texas Hill Country, USA (© Rolf Nussbaumer/Danita Delimont)

Lifeguard shack at sunset on The Entrance beach, Central Coast, NSW (© Yury Prokopenko/Getty Images)

Guanajuato, Mexico (© AI NISHINO/Alamy)

Golden ginkgo leaves at Xuanwu Lake Park in Nanjing, Jiangsu Province, China (© SIPA Asia/ZUMA Wire/Alamy)

Icelandic sheep ready for réttir, Iceland (© Pieter Tytgat/Getty Images)

Sailboats in Warnemünde, Germany (© Rico Ködder/Getty Images)

Sea otter mother and newborn pup in Monterey Bay, California, USA (© Suzi Eszterhas/Minden Pictures)

The Ship of Tolerance, an international art installation in Zug, Switzerland (© Linda Kennard/Alamy)

Hobbiton, near Matamata, North Island, New Zealand (© 500px Asia/Getty Images)

Red tulips at Floriade flower and entertainment festival, Canberra (© Jenny Dettrick/Getty Images)

Golden ginkgo leaves at Xuanwu Lake Park in Nanjing, Jiangsu province, China (© SIPA Asia/ZUMA Wire/Alamy)

Catspaw (Anigozanthos humilis) flowers, Yilliminning Rock Reserve, Western Australia (© Krystyna Szulecka/Minden Pictures)

Loarre Castle, Huesca province, Aragón, Spain (© Sebastian Wasek/Alamy)

Fraser River east of Vancouver, British Columbia, Canada, with the Golden Ears mountains (© LeonU/Getty Images)

Blue shark near the Azores in the North Atlantic Ocean (© Nuno Sa/Minden Pictures)

Steeply terraced vineyards of the Lavaux region on the shores of Lake Geneva, Switzerland (© Yves Marcoux/plainpicture)

A saturniid moth in Mole National Park in Larabanga, Ghana (© Robert Thompson/Minden Pictures)

Lantern display celebrating the Mid-Autumn Festival in Singapore (© Khin/Getty Images)