Hang Sơn Đoòng cave, Phong Nha-Kẻ Bàng National Park, Vietnam (© Geng Xu/Getty Images)

Trunk Bay, St. John, Virgin Islands National Park (© cdwheatley/Getty Images)

Three Natural Bridges, Wulong Karst National Geology Park, China (© Pav-Pro Photography Ltd/Shutterstock)

Impala and red-billed oxpecker, South Africa (© Matrishva Vyas/Getty Images)

Lavender field, Hertfordshire, England (© George W Johnson/Getty Images)

Molokini, Maui, Hawaii (© Douglas Peebles/eStock Photo)

St. Joseph North Pier Inner and Outer Lights, Michigan (© Kenneth Keifer/Getty Images)

Spotted owlet, Bangkok, Thailand (© Tfilm/Getty Images)

Joshua Tree National Park, California (© Chris Moore - Exploring Light Photography/Tandem Stills + Motion)

Wooden path to Kennedy Lake, Vancouver Island, BC, Canada (© EB Adventure Photography/Shutterstock)

African elephants, Amboseli National Park, Kenya (© Ruzdi Ekenheim/Getty Images)

Cliffs of Telašćica Nature Park, Dugi Otok Island, Croatia (© Ilija Ascic/Shutterstock)

Thorny devil, Watarrka National Park, Australia (© Yva Momatiuk and John Eastcott/Minden Pictures)

Red Fort Delhi front view with Indian National Flag (© Roop Dey/Alamy Stock Photo)

Roller coaster in Nagashima Spa Land, Mie prefecture, Japan (© Japanese amateur photographer/Getty Images)

Alfanzina lighthouse, Algarve, Portugal (© Andreas Kunz/Getty Images)

Huntington Beach Pier, California, at sunset (© Stan Moniz Photography/Tandem Stills + Motion)

Festival of Raksha Bandhan (© Dinodia Photo/Getty Images)

Sunrise at Grand Teton National Park, Wyoming (© Kurt Budliger/Tandem Stills + Motion)

Nazca boobies, Wolf Island, Galápagos Islands, Ecuador (© Tui De Roy/Minden Pictures)

Aerial view of Ocean City, Maryland, at sunrise (© Kevin Olson/Amazing Aerial Agency)

Prasat Phanom Rung temple ruins, Buriram province, Thailand (© Banjongseal324/Getty Images)

Katahdin Woods and Waters National Monument, Penobscot County, Maine (© Cavan Images/Alamy)

Arched parapets of the Golconda Fort in Hyderabad, Telangana (© Manab Sen/Alamy Stock Photo)

Palmyra Atoll National Wildlife Refuge, Central Pacific Ocean (© Ian Shive/Tandem Stills + Motion)

Young black caiman, Tambopata National Reserve, Peru (© Maxime Aliaga/Minden Pictures)

Montmartre and Sacre Cœur, Paris, France (© Tuul & Bruno Morandi/Getty Images)

Castellfollit de la Roca, Catalonia, Spain (© Eloi_Omella/Getty Images)

A whale shark in Cenderawasih Bay, West Papua, Indonesia (© Andy Lerner/Tandem Stills + Motion)

Rock formations and sand dunes in the Sahara, Djanet, Algeria (© Airpano/Amazing Aerial Agency)

River Thames, London, England (© Puthipong Worasaran/Getty Images)