The Peace Tower on Parliament Hill, Ottawa (© Dennis Macdonald/Getty Images)

Solar eclipse sequence from August 21, 2017 (© Lindsay Daniels/Tandem Stills + Motion)

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

Salcombe Harbour on the south coast of Devon, England (© Devon and Cornwall Photography/Getty Images)

Spectators at the annual Calgary Stampede (© Pete Ryan/Getty Images)

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

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

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

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

Earth at night (© NASA)

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

Sailors begin their journey from Chicago to Mackinac Island, Michigan during the Race to Mackinac (© 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)

Sheep flock in the Gobi Desert (© Patrick Baz/Getty Images)

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

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

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

Saint Pierre panorama at sunrise, Saint Pierre and Miquelon (© Henryk Sadura/Getty 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)

Aerial view of Elk Falls suspension bridge on Vancouver Island (© Ink Drop/Alamy Stock Photo)

Trillium Lake in Mount Hood National Forest, Oregon (© Frank Krahmer/Getty Images)

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)