Mandarin ducks perched on a branch (© Thomas Langley/Alamy)(Bing United States)

Mandarin ducks perched on a branch (© Thomas Langley/Alamy)(Bing United States)

Ancient rock art in Chiribiquete National Natural Park, Colombia (© Steve Winter/Getty Images)(Bing United States)

Ancient rock art in Chiribiquete National Natural Park, Colombia (© Steve Winter/Getty Images)(Bing United States)

Lewis and Clark National and State Historical Parks in Oregon on the anniversary of Lewis and Clark reaching the Pacific (© Morey Milbradt/Alamy)(Bing United States)

Lewis and Clark National and State Historical Parks in Oregon on the anniversary of Lewis and Clark reaching the Pacific (© Morey Milbradt/Alamy)(Bing United States)

For Monet's birthday, at the Musée d'Orsay in Paris (© VCG Wilson/Corbis via Getty Images)(Bing United States)

For Monet's birthday, at the Musée d'Orsay in Paris (© VCG Wilson/Corbis via Getty Images)(Bing United States)

A sleeping Kermode bear in British Columbia, Canada (© John E Marriott/SuperStock)(Bing United States)

A sleeping Kermode bear in British Columbia, Canada (© John E Marriott/SuperStock)(Bing United States)

The DC War Memorial, honoring residents of Washington, DC, who fought in World War I (© Sean Pavone/Alamy)(Bing United States)

The DC War Memorial, honoring residents of Washington, DC, who fought in World War I (© Sean Pavone/Alamy)(Bing United States)

‘Wave,’ part of ‘Blood Swept Lands and Seas of Red,’ an art installation pictured here at the Imperial War Museum North in Manchester, England (© Christopher Furlong/Getty Images)(Bing United States)

‘Wave,’ part of ‘Blood Swept Lands and Seas of Red,’ an art installation pictured here at the Imperial War Museum North in Manchester, England (© Christopher Furlong/Getty Images)(Bing United States)

South Dakota’s Badlands National Park turns 40 (© Tetra Images/Getty Images)(Bing United States)

South Dakota’s Badlands National Park turns 40 (© Tetra Images/Getty Images)(Bing United States)

Cup fungus in Corcovado National Park, Costa Rica (© Alex Hyde/Minden Pictures)(Bing United States)

Cup fungus in Corcovado National Park, Costa Rica (© Alex Hyde/Minden Pictures)(Bing United States)

Manatees in Blue Spring State Park, Florida (© Paul Nicklen/Getty Images)(Bing United States)

Manatees in Blue Spring State Park, Florida (© Paul Nicklen/Getty Images)(Bing United States)

Students light oil lamps to celebrate Diwali in Guwahati, India (© Anuwar Hazarika/Reuters)(Bing United States)

Students light oil lamps to celebrate Diwali in Guwahati, India (© Anuwar Hazarika/Reuters)(Bing United States)

Students light oil lamps to celebrate Diwali in Guwahati, India (© Anuwar Hazarika/Reuters)(Bing United States)

Students light oil lamps to celebrate Diwali in Guwahati, India (© Anuwar Hazarika/Reuters)(Bing United States)

Detail of the Lincoln Memorial, Washington, DC (© Walter Bibikow/Danita Delimont)(Bing United States)

Detail of the Lincoln Memorial, Washington, DC (© Walter Bibikow/Danita Delimont)(Bing United States)

Neuschwanstein Castle in southern Bavaria, Germany (© Boris Jordan Photography/Getty Images)(Bing United States)

Neuschwanstein Castle in southern Bavaria, Germany (© Boris Jordan Photography/Getty Images)(Bing United States)

Runners on the Verrazzano-Narrows Bridge between Staten Island and Brooklyn (© David Madison/Getty Images)(Bing United States)

Runners on the Verrazzano-Narrows Bridge between Staten Island and Brooklyn (© David Madison/Getty Images)(Bing United States)

American bison in Antelope Island State Park, Utah (© Conor Barry/Aurora Photos)(Bing United States)

American bison in Antelope Island State Park, Utah (© Conor Barry/Aurora Photos)(Bing United States)

Dancing at the Gallup Inter-Tribal Indian Ceremonial in New Mexico (© Chuck Place/Alamy)(Bing United States)

Dancing at the Gallup Inter-Tribal Indian Ceremonial in New Mexico (© Chuck Place/Alamy)(Bing United States)

Calaca figures to celebrate the Day of the Dead (© PvE/Alamy)(Bing United States)

Calaca figures to celebrate the Day of the Dead (© PvE/Alamy)(Bing United States)