Wild boar and piglet in the Forest of Dean, Gloucestershire, England (© NPL/Minden Pictures)(Bing United States)

The Bernese Alps from Jungfraujoch railway station in Switzerland (© Markus Eichenberger Photo/Nimia)(Bing United States)

The Bernese Alps from Jungfraujoch railway station in Switzerland (© Markus Eichenberger Photo/Nimia)(Bing United States)

Saffrondrop bonnet mushrooms in Meerdaal, Belgium (© Danny Lap/Minden Pictures)(Bing United States)

Hot air balloon inflating for the Winthrop Balloon Festival in Washington State (© Muralee Raghavan)(Bing United States)

The laurel trees of Madeira Natural Park, Portugal (© Frank Krahmer/Getty Images)(Bing United States)

Building exterior on First Avenue in Manhattan, New York City (© Johnér/Offset)(Bing United States)

Stars above, sea sparkle below in Oregon’s Cape Sebastian State Scenic Corridor (© David Pasillas/500px)(Bing United States)

A memorial wall to women in Konak, Izmir, Turkey (© Cem Oksuz/Getty Images)(Bing United States)

A mangrove forest near Palau (© WaterFrame/Alamy)(Bing United States)

Rolling hills and red earth in Dongchuan, China (© Praphat Rattanayanon/Getty Images)(Bing United States)

A male pine warbler perched on an icy branch (© Rolf Nussbaumer Photography/Alamy)(Bing United States)

Beech forest near Tokamachi, Japan (© JTB Photo/age fotostock)(Bing United States)

A grizzly in the Great Bear Rainforest, British Columbia, Canada (© Jack Chapman/Minden Pictures)(Bing United States)

‘The Globe’ sculpture by Joe Smith, Knockan Crag National Nature Reserve, Scotland (© Mar Photographics/Alamy)(Bing United States)

The Caldeirão on Corvo Island, Portugal (© Samuel Domingues/500px)(Bing United States)

The Azure Window, a natural stone arch near Dwejra Beach, Gozo, Malta (© SIME/eStock Photo)(Bing United States)

The dome of the Reading Room of the National Library of Ireland in Dublin (© Cahir Davitt/plainpicture)(Bing United States)

Adolescent frog in a pool of water on a giant lily pad (© Adhi Prayoga/REX Shutterstock)(Bing United States)

Tumwater Canyon Pipeline Trail over the Wenatchee River in Washington State (© Inge Johnsson/Alamy)(Bing United States)

Early blooming crocus (© suterscher/iStock/Getty Images)(Bing United States)

Danum Valley Conservation Area, Sabah, Malaysia (© Steve Bloom Images/Alamy)(Bing United States)

Dynjandi Falls, Iceland (© Garret Suhrie/Tandem Stills + Motion)(Bing United States)

Epupa Falls between Angola and Namibia (© Frank Tusch/plainpicture)(Bing United States)

Dawn over the Fox River at De Pere, Wisconsin (© James G Brey/Shutterstock)(Bing United States)

Walrus swimming in the Arctic Ocean (© Fabrice Simon/Corbis)(Bing United States)

San Juan de Gaztelugatxe, Bermeo, Basque Country, Spain (© Mimadeo/Shutterstock)(Bing United States)

Baby feral domestic rabbit, Ōkunoshima Island (aka Rabbit Island), Hiroshima, Japan (© Yukihiro Fukuda/Minden Pictures)(Bing United States)

Hot springs in Dallol, Ethiopia (© Kazuyoshi Nomachi/Corbis)(Bing United States)

Detail of the Messe Basel Exhibition Hall in Basel, Switzerland (© View Pictures/REX Shutterstock)(Bing United States)

West Bow, a street in Edinburgh, Scotland (© Rory McDonald/Getty Images)(Bing United States)

White Pocket in the Vermilion Cliffs National Monument, Arizona (© Harun Mehmedinovic/Tandem Stills + Motion)(Bing United States)