Harbour and longtail boats at Ko Samui, Thailand (© Foto2rich/Shutterstock)

Group of people playing Holi in Rajasthan (© Bartosz Hadyniak/Getty Images)

Purple crocus flowers, Seven Rila Lakes, Bulgaria (© Maya Karkalicheva/Getty Images)

The Wave residential building, Vejle, Denmark (© Frank Bach/Alamy)

Humpback whales, Monterey Bay, California, United States (© Kiliii Fish/Cavan Images)

Akbar's tomb, Agra, Uttar Pradesh (© zeelichsheng/Shutterstock)

Grey seal sleeping on the beach, Orkney Islands, Scotland (© Andrew Mason/Minden Pictures)

Geothermal blue pool Bláhver at Hveravellir, Iceland (© Juan Maria Coy Vergara/Getty Images)

Peach trees in bloom, Cieza, Murcia, Spain (© Juan Maria Coy Vergara/Getty Images)

Juvenile sunbittern displaying at nest, Ecuador (© Andy Rouse/naturepl.com)

Vaults of the Church of Notre Dame de Bon-Port, Les Sables-d'Olonne, France (© Helmut Meyer zur Capellen/Alamy)

Lanyon Quoit, a Neolithic dolmen in Cornwall, England (© Helen Hotson/Alamy)

Pacific Rim National Park Reserve, Vancouver Island, Canada (© EmilyNorton/Getty Images)

Giant panda eating bamboo, China (© Entwicklungsknecht/Getty Images)

Grianan of Aileach ring fort, Donegal, Ireland (© aluxum/Getty Images)

Cherry blossoms at Tom McCall Waterfront Park, Portland, Oregon, United States (© Eric Vogt/Tandem Stills + Motion)

Short-beaked echidna, Adelaide Hills, Australia (© Etienne Littlefair/naturepl.com)

Snowdrops in spring (© klagyivik/Getty Images)

Letea Forest, Danube Delta, Romania (© Wild Wonders of Europe/Widstrand/Nature Picture Library)

Lake Tanganyika, Africa (© BEST-BACKGROUNDS/NASA/Shutterstock)

Lightning storm over saguaro cacti, Sonoran Desert, Arizona, United States (© Jack Dykinga/Nature Picture Library)

Cherry blossoms at East Lake Cherry Blossom Park, Wuhan, China (© Zhang Qiao/VCG/Getty Images)

Juvenile manatees in a freshwater spring, Crystal River, Florida, United States (© Gregory Sweeney/Getty Images)

Logan Creek Suspension Bridge, West Coast Trail, Canada (© Tandem Stock/Adobe Stock)

Radio City Music Hall in New York City, United States (© Clarence Holmes Photography/Alamy)

African buffalo, Ngorongoro Crater, Tanzania (© jesuss8/500px/Getty Images)

Peggy's Point Lighthouse, Atlantic Coast, Nova Scotia, Canada (© Prashanth Bala/Shutterstock)

Demoiselle cranes, India (© Axel Gomille/Nature Picture Library)

Paradise Cave, Phong Nha-Ke Bang National Park, Vietnam (© Pakawat Thongcharoen/Getty Images)

The Great Stupa at Sanchi, Madhya Pradesh (© Dmitry Rukhlenko - Photos of India/Alamy)