Amphitheatre of El Jem, Tunisia (© Westend61/Getty Images)

Sandstone butte in Capitol Reef National Park, Utah, USA (© Amazing Aerial Premium/Shutterstock)

Zelenci Nature Reserve, Slovenia (© Andrey Danilovich/Getty Images)

Tintern Abbey, Wales (© matthibcn/Getty Images)

Atlantic puffin, Iceland (© Peter Hering/Minden Pictures)

Kagami-ike (Mirror Pond), Nagano, Japan (© Shoji Fujita/Getty Images)

Bodie Island Lighthouse, Nags Head, North Carolina, USA (© Michael Ver Sprill/Getty Images)

Blacktip reef sharks, Maldives (© Filippo Bacci/Getty Images)

Indigenous artwork, Ngaruwanajirri Art Centre, Wurrumiyanga, Bathurst Island, Australia (© Robert Wyatt/Alamy)

A lion in Maasai Mara, Kenya (© Scott Davis/Tandem Stills + Motion)

'Gateway' pool at Jupiter Artland sculpture park, Edinburgh, Scotland (© Owen Humphreys/PA Images/Alamy)

Elephant family in Amboseli National Park, Kenya (© Ibrahim Suha Derbent/Getty Images)

Perseid meteor shower, Cottonwood Canyon State Park, Oregon (© Joshua Meador/Tandem Stills + Motion)

Tiny gecko on leaf (© Darren Greenwood/Alamy)

Indian flags selling on Independence Day (© yogesh more/Alamy Stock Photo)

Overseas Highway in the Florida Keys (© Evgeny Vasenev/Cavan Images)

Piazza IX Aprile, Taormina, Sicily, Italy (© rudi1976/Alamy)

'Avatar Mountains,' Zhangjiajie National Forest Park, China (© Amazing Aerial Premium/Shutterstock)

Squirrel looking into the lens of a camera (© Alfredo Piedrafita/Getty Images)

Start Point Lighthouse, South Devon, England (© Guy Edwardes/Minden Pictures)

Skógafoss waterfall, Iceland (© Maridav/Shutterstock)

Full Moon set at dawn, behind Cenotaphs, Orchha, Madhya Pradesh, India (© Vaibhav Tripathi/Alamy Stock Photo)

Shark Fin Cove, Davenport, California (© Jeff Lewis/Tandem Stills + Motion)

Lower Yellowstone Falls, Yellowstone National Park, Wyoming (© Tim Fitzharris/Minden Pictures)

Berlin Cathedral and Museum Island, Berlin, Germany (© Rudy Balasko/Shutterstock)

Seongsan Ilchulbong, a tuff cone on Jeju Island, South Korea (© Quynh Anh Nguyen/Getty Images)

Fort Lovrijenac, West Harbour, Dubrovnik, Croatia (© Benny Marty/Shutterstock)

Turkey tail mushroom, Brevard, North Carolina (© Bill Gozansky/Alamy)

Rakhi or sacred thread of different types and colors (© Ritesh Shukla/Pacific Press/LightRocket via Getty Images)

Saguaro cacti, Ironwood National Monument, Arizona (© Jack Dykinga/Minden Pictures)

Boat at backwaters of Kerala, India (© Goran Bogicevic/Alamy Stock Photo)