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

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

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

Mountain bikers on White Rim Road in Canyonlands National Park, Utah (© Grant Ordelheide/Tandem Stills + Motion)

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

Walter's Wiggles on the Angels Landing Trail in Zion National Park, Utah (© Dennis Frates/Alamy)

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

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

Olive trees and poppies in Luberon Regional Nature Park, France (© Hemis/Alamy)

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 Regional Nature Park, France (© Hemis/Alamy)

Kettle River Recreation Area bursting with wildflowers after a fire destroyed much of the forest, British Columbia, Canada (© Debra Brash/plainpicture)

Surfer on the beach in Medewi, Bali, Indonesia (© helivideo/Getty Images)

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

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

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

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

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

Jungle cat hunting (© Lila/Alamy)

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

Bull Point in Devon, England (© Robert Harding World Imagery/Offset by Shutterstock)

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)

Chateau de Castelnaud in Perigord, France (© Peter Adams/Offset by Shutterstock)

Bridge over Las Tablas de Daimiel National Park wetland, Ciudad Real, Spain (© Jacinto Marabel Romo/Shutterstock)

Lavender field at Hinode Farm, Kamifurano, Hokkaido, Japan (© DoctorEgg/Getty Images)

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