Charminar during Eid celebrations, Hyderabad, India (© Prudhvi Chowdary/iStock/Getty Images Plus)

Gemsbok (Oryx gazella) in sand dunes, Namibia (© Sergey Gorshkov/Minden)

Black sand beach at Wai'anapanapa State Park, Maui, Hawaii (© Matt Anderson Photography/Getty Images)

'Priscilla the Parrotfish' art installation at Como Park Zoo & Conservatory, St. Paul, Minnesota (© Michael Siluk/UCG/Universal Images Group via Getty Images)

The chalk cliffs of Étretat, Normandy, France (© MarcelloLand/Getty Images)

Pueblo Bonito, Chaco Culture National Historical Park, New Mexico (© Ian Shive/Tandem Stills + Motion)

Humpback whale (© Philip Thurston/Getty Images)

Porto Cathedral, Portugal (© Reinhard Schmid/Huber/eStock Photo)

Goliath heron, Kruger National Park, South Africa (© Johan Swanepoel/Alamy)

Prickly pear cactus, Big Bend National Park, Texas (© Tim Fitzharris/Minden Pictures)

Spanish moss trees over a boardwalk in the Okefenokee Swamp, Folkston, Georgia (© Emmer Photo/Alamy)

A field with thatched-roof huts, Punjab, India (© Jatin Malhotra/500px/Getty Images)

Synchronous fireflies, Great Smoky Mountains National Park, Tennessee (© Floris Van Bruegel/Minden Pictures)

Synchronous fireflies, Great Smoky Mountains National Park, Tennessee, USA (© Floris Van Bruegel/Minden Pictures)

Aerial View of Achyutaraya temple, Hampi, India (© ImagesofIndia/Shutterstock)

Common tern father with chick, Nickerson Beach, Long Island, New York (© Vicki Jauron, Babylon and Beyond Photography/Getty Images)

Common tern father with chick, Nickerson Beach, Long Island, New York, USA (© Vicki Jauron, Babylon and Beyond Photography/Getty Images)

Bald eagle, Tongass National Forest, Alaska (© Jaynes Gallery/Shutterstock)

Stonehenge, Salisbury Plain, Wiltshire, England (© Captain Skyhigh/Getty Images)

Amazon rainforest, Peru (© Rhett Ayers Butler/Getty Images)

Monarch butterflies feeding from blazing star wildflowers (© bookguy/Getty Images)

Nha Phu Bay, Nha Trang, Vietnam (© Thang Tat Nguyen/Getty Images)

The Treasury of Petra, Jordan (© WitthayaP/Shutterstock)

Château de Villandry and its garden, Loire Valley, France (© VLADJ55/Shutterstock)

Sedona, Arizona (© Jonathan Ross/Getty Images)

Rainbow flags and confetti (© Arctic-Images/Getty Images)

Banyak Islands, Sumatra, Indonesia (© fbxx/Getty Images)

Brown bear mother and cub, Lake Clark National Park and Preserve, Alaska, USA (© Carlos Carreno/Getty Images)

Tour de France cyclists crossing the Pont du Gard, France (© Gonzalo Fuentes/Getty Images)