London Millennium Bridge with St. Paul's Cathedral in the background, London, England (© Scott Baldock/Getty Images)

Great Barrier Reef, Queensland, Australia (© AWL Images/Danita Delimont)

Sunwapta Falls in Jasper National Park, Alta. (© Schroptschop/Getty Images)

View of a waterfall at Mystic Beach in Juan de Fuca Provincial Park, B.C. during dusk (© DEEPOL/Plainpicture)

Pont Fawr, a stone arch bridge in Llanrwst, Wales, UK (© Pajor Pawel/Shutterstock)

Synchronous fireflies illuminate the forests of Great Smoky Mountains National Park, Tennessee (© Floris van Breugel/Minden Pictures)

Opal Range surrounded by fog, Kananaskis Country, Alberta (© Tim Fitzharris/Minden Pictures)

Hermitage of La Pertusa, Lleida province, Spain (© bbsferrari/Getty Images)

Galápagos sea lion off the shore of Fernandina Island, Galápagos Islands, Ecuador (© Tui De Roy/Minden Pictures)

Baron Lake in the Sawtooth Wilderness in Idaho (© Patrick Brandenburg/Tandem Stills + Motion)

Griboyedov Canal and the Church of the Savior on Spilled Blood in Saint Petersburg, Russia (© Tomas Sereda/Getty Images)

Santa Elena Canyon under the Milky Way in Big Bend National Park, Texas (© Stanley Ford/Shutterstock)

The Dourbie Gorge Corps Mill and adjoining bridge in Grands Causses Natural Regional Park, France (© Hemis/Alamy)

Kettle River Recreation Area bursting with wildflowers after a fire destroyed much of the forest (© Debra Brash/Plainpicture)

Surfer walking between palm trees in Medewi, Bali, Indonesia (© helivideo/GettyImages)

St. Stephen's Green in Dublin, Ireland (© L_E/Shutterstock)

Beaver Falls on Havasu Creek in the Grand Canyon, Arizona (© Edwin Verin/Alamy)

Jabiru storks in the Pantanal of Brazil (© Juan-Carlos Munoz/Minden Pictures)

Midsummer light captured at a lake near the city of Örebro, Sweden (© Anders Jorulf/Getty Images)

Artist Saype's 'Beyond Walls' installation in the Parc de la Grange, Geneva, Switzerland (© Valentin Flauraud/Shutterstock)

A bearded emperor tamarin monkey carrying a baby (© Chris White/iStock/Getty Images Plus)

Male southern double-collared sunbird on rocket pincushion flower, Kirstenbosch Garden, Cape Town, South Africa (© Martin Willis/Minden Pictures)

Pyramid Lake in Jasper National Park, Alta. (© Peter Adams Photography Ltd/Alamy Stock Photo)

Aerial view of blue and white parasols on the rocky coast of Rhodes, an island in Greece (© Amazing Aerial Agency/Offset by Shutterstock)

German Navy tall ship Gorch Fock in waters close to Reykjavík, Iceland (© DEEPOL by plainpicture/Henn Photography)

Grandidier's baobab forest near Morondava, Madagascar (© Thomas Marent/Minden Pictures)

The Sanctuary of Madonna della Corona in Italy (© Volodymyr Kalyniuk/Alamy)

Moraine Lake in Banff National Park, Alta. (© Schroptschop/Getty Images)

Goats in an argan tree near Essaouira, Morocco (© Nizz/Shutterstock)

The Bojo River in Cebu, Philippines (© Amazing Aerial Agency/Offset by Shutterstock)