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

Mount Foraker viewed from Denali, Denali National Park, Alaska, USA (© Andrew Peacock/Tandem Stills + Motion)

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)

Highways in Taipei, Taiwan (© Tavarius/Shutterstock)

Pan di Zucchero sea stack in Masua, Sardinia, Italy (© DaLiu/Getty Images)

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

Helmcken Falls, Wells Gray Provincial Park, British Columbia, Canada (© Laurens Verhoeven/Getty Images)

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 spear (© Darren Greenwood/Alamy)

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

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

Rothenburg ob der Tauber, Bavaria, Germany (© RudyBalasko/Getty Images)

'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)

Emerald Lake, South Klondike Highway, Yukon, Canada (© artherng/Getty Images)

Skógafoss waterfall, Iceland (© Maridav/Shutterstock)

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

Lower Yellowstone Falls, Yellowstone National Park, Wyoming, USA (© 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)

American bison, Grand Teton National Park, Wyoming, USA (© Enrique Aguirre Aves/Getty Images)

Whale shark, Ningaloo Reef, Western Australia (© Jason Edwards/Getty Images)

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