Benagil Cave in the Algarve, Portugal (© Michael Malorny/Offset by Shutterstock)

Porto Flavia, Sardinia, Italy (© Visualframing/Adobe Stock)

The 'Alien Egg Hatchery' in the Bisti/De-Na-Zin Wilderness, New Mexico (© Ian Shive/Tandem Stills + Motion)

Houseboats in the backwaters in Alappuzha, Kerala, India (© Martin Harvey/The Image Bank/Getty Images)

The Regata Storica on the Grand Canal in Venice, Italy (© Alexander Duffner/Alamy)

Howgill Fells in the Yorkshire Dales National Park, England (© davidnmoorhouse/iStock/Getty Images Plus)

Humpback whales off the coast of Massachusetts (© Eric Kulin/plainpicture)

Livraria Lello in Porto, Portugal (© Nido Huebl/Shutterstock)

San Juan Islands, Washington (© Stephen Matera/Tandem Stills + Motion)

Panchamukhi Ganesh statue (© Tomexx/iStock/Getty Images Plus)

Asian elephants in West Bengal, India (© Avijan Saha/Minden Pictures)

Aerial view of the Venice Skatepark in Venice Beach, Los Angeles (© Ingus Kruklitis/Getty Images)

Aldeyjarfoss waterfall in northern Iceland's interior landscape (© Jim Patterson/Tandem Stills + Motion)

Birnbeck Pier on the Bristol Channel in Weston-super-Mare, England (© Stephen Davies/Adobe Stock)

Palacio de Bellas Artes, Mexico City (© Lukas Bischoff Photograph/Shutterstock)

The monuments of Orchha in Madhya Pradesh, India (© Kevin Standage/Shutterstock)

Red panda at the Chengdu Panda Base in Sichuan province, China (© Biosphoto/Alamy)

Roe deer buck, Schleswig-Holstein, Germany (© Helge Schulz/Minden Pictures)

Starlings during the autumn migration in the wetlands between Denmark and Germany (© Viking/Alamy)

'Rising Moon' lantern to celebrate the Mid-Autumn Festival in Hong Kong's Victoria Park (© Bobby Yip/Reuters)

Baby white rhinoceros and mother in Hluhluwe–Imfolozi Park, South Africa (© Martin Harvey/Alamy)

｢海王星｣ (© NASA/JPL)

Cusco Cathedral on the Plaza de Armas, Cusco, Peru (© sharptoyou/Shutterstock)

Sahyadri mountain range during the monsoon season in India (© Bhushan Patil Photography/Moment Open Collection/Getty Images)

Escarpment Trail, Porcupine Mountains Wilderness State Park, Michigan, USA (© Pat & Chuck Blackley/Alamy)

Thorn bug, Pico Bonito National Park, Honduras (© Mac Stone/Tandem Stills + Motion)

Mount Fuji in Japan (© The Asahi Shimbun/Getty Images)

A wood bison near Behchoko, in the Northwest Territories, Canada (© Don Johnston/agefotostock)

Container ship in San Pedro, California (© Cameron Venti/Getty Images)

Hyacinth macaws in the Pantanal region of Brazil (© David Pattyn/Minden Pictures)