Great horned owl sitting in an aspen tree, Alberta, Canada (© Ambre Haller/Getty Images)

Cork trees in Los Alcornocales Natural Park, Spain (© Andrés M. Domínguez/Minden)

Chandra Tal lake in the Himalayas, India (© f9photos/Getty Images Plus)

普什卡骆驼节上的骆驼与牧民，印度拉贾斯坦邦 (© Anand Purohit/Getty Images)

Saffron crocus flowers in Spain (© Juan-Carlos Munoz/Minden Pictures)

Jardin des Tuileries in autumn, leading to the Louvre Museum in Paris, France (© Brian A. Jackson/Getty Images Plus)

Chapel St-Michel d'Aiguilhe, Le Puy-en-Velay, France (© Jaubert French Collection/Alamy Stock Photo)

Autumn colors reflected in Mirror Pond (Kagami-ike), Nagano, Japan (© magicflute002/Getty images)

Frost on blueberry plants, New Brunswick, Canada (© Freeman Patterson/Masterfile)

Wildflowers in the mist on Mount Howitt in Alpine National Park, Victoria, Australia (© Australian Scenics/Photolibrary/Getty Images Plus)

Rodrigo Koxa riding the biggest wave ever surfed, on Nov 8, 2017, off the coast of Nazaré, Portugal (© Pedro Cruz/AP Photo)

Tantallon Castle at sunset from Seacliff Beach, East Lothian, Scotland (© Scott Masterton/Westend61/Offset)

Trifels Castle in the Palatinate Forest, Rhineland-Palatinate, Germany (© Björn Lauer/Getty Images)

Fog shrouds the Bavarian Alps in Germany (© Anton Petrus/Getty Images)

Fog shrouds the Bavarian Alps in Germany (© Anton Petrus/Getty Images)

Bridges over the Vltava River, Prague, Czech Republic (© Markus Lange/Offset)

Manatees in the Ichetucknee River, Florida (© Jennifer Adler/Alamy)

Wildflowers in the mist on Mount Howitt in Alpine National Park, Victoria, Australia (© Australian Scenics/Photolibrary/Getty Images Plus)

Gelada monkeys in Simien Mountains National Park, northern Ethiopia (© Marco Gaiotti/plainpicture)

Lantignié in the Beaujolais region of France (© Jon Arnold/Danita Delimont)

Low-lying cloud over Loch Chon, the Trossachs, Scotland (© Alistair Dick/Alamy)

Queen Victoria agave plant (© Moab Republic/Shutterstock)

A cypress tree in the Atchafalaya Basin, Louisiana (© Chris Moore/Tandem Stills + Motion)

Monarch butterflies wintering in Michoacán, Mexico (© Sylvain Cordier/Getty Images)

Highland cattle in Drenthe province, Netherlands (© defotoberg/Shutterstock)

Sky Harbor International Airport in Phoenix, Arizona (© Nearmap/Getty Images)

The Maroon Bells, near Aspen, Colorado (© Christopher E. Herbert/Getty Images)

The Maroon Bells, near Aspen, Colorado (© Christopher E. Herbert/Getty Images)

Jemaa el-Fnaa Square in Marrakesh, Morocco (© Pavliha/Getty Images)