The Transfăgărășan in Transylvania, Romania (© Calin Stan/Shutterstock)

Ratha Yathra chariot being pulled in Odisha (© DIBYANGSHU SARKAR/AFP/Getty Images)

Peel Castle on St Patrick’s Isle, Isle of Man (© Massimo Ripani/SIME/eStock Photo)

Peloton during the 2018 Tour de France in Valence, France (© Justin Setterfield/Getty Images)

Caribou in Kobuk Valley National Park, Alaska, USA (© Staffan Widstrand/Minden Pictures)

Blue walls of Chefchaouen, Morocco (© Tatsuya Ohinata/Getty Images)

Jaguar in the Pantanal wetlands, Brazil (© Andy Rouse/Minden Pictures)

Visitors on El Caminito del Rey in the province of Málaga, Spain (© Ken Welsh/Alamy)

Earth at night (© NASA)

The cypress tunnel at Point Reyes National Seashore in California (© Rachid Dahnoun/Tandem Stills + Motion)

Sailors begin their race from Chicago to Mackinac Island, Michigan, USA (© Karen I. Hirsch/Alamy)

Waterperry Gardens in Oxfordshire, England (© Lauren Hibbit/Danita Delimont)

Mount Fuji and twin rocks (Ushitukiiwa) in Matsuzaki, Japan (© Tommy Tsutsui/Getty Images)

The Ernest Hemingway Home and Museum in Key West, for Hemingway Days (© Werner Bertsch/eStock Photo)

Aerial view of Ajanta Caves, Maharashtra (© www.victoriawlaka.com/Getty Images Plus)

Leatherback sea turtles in Trinidad and Tobago (© Shane P. White/Minden Pictures)

Garden of the Gods Park in Colorado Springs, Colorado, USA (© lightphoto/iStock/Getty Images)

Artist Luke Jerram's installation 'Museum of the Moon' at Liverpool Cathedral, England (© Christopher Furlong/Getty Images)

Adalaj, one of the finest of the Gujarati stepwells (© Kelly Cheng Travel PhotographyGetty Images)

Hummingbird hawk-moth feeding on flower, Sardinia, Italy (© patriziomartorana/iStock/Getty Images Plus)

The Skywalk on Rock of Gibraltar (© Stephen Ball/Alamy)

Meerkats in the Kalahari Desert in Botswana (© Aluma Images/Getty Images)

Jane's Carousel in Brooklyn, New York (© Grzegorz Gill/Shutterstock)

Alphorn musicians perform during the International Alphorn Festival in Nendaz, Switzerland (© Fabrice Coffrini/Getty Images)

The shoreline of Gandoca-Manzanillo Wildlife Refuge, in Costa Rica (© Greg Basco/Minden Pictures)

Carhenge, created by Jim Reinders near Alliance, Nebraska (© Charlie Summers/Minden Pictures)

Bengal tiger watching deer in Bandhavgarh Tiger Reserve, Madhya Pradesh (© Santosh Saligram/Alamy Stock Photo)

Giant tortoises on Alcedo Volcano in the Galapagos Islands (© Tui De Roy/Minden Pictures)

A treetop walkway in the Bavarian Forest National Park, Neuschönau, Germany (© imageBROKER/Alamy)

Hawaii Volcanoes National Park, Hawaii (© Grant Ordelheide/Tandem Stills + Motion)