'Greetings From Giza' by Jean Rene, in Cairo, Egypt (© Ammar ABD RABBO/Abaca Press/Alamy)

Cherry blossom trees in Vancouver (© KarenMassier/Getty Images)

Whangarei Falls located in Whangarei Scenic Reserve on North Island, New Zealand (© Nathan Kavumbura/Getty Images)

The Kjeragbolten boulder on Kjeragin Rogaland, Norway (© Angel FAyE/Getty Images)

Goðafoss waterfall under the northern lights, Iceland (© Anton Petrus/Getty Images)

Crested caracara birds courting in Texas (© Alan Murphy/Minden Pictures)

Old town of Málaga, Spain (© Sean Pavone Photo/Getty Images)

Coast near Ponta Delgada, Madeira, Portugal (© Jan Wlodarczyk/Alamy)

Arvada Skatepark, Arvada, Colorado (© Jon Paciaroni/Getty Images)

Caracal cubs (© Marion Vollborn/Minden Pictures)

Fiddlehead fern fronds in Quebec (© Marianna Armata/Getty Images)

The waning gibbous moon is pictured above the Earth's horizon from the International Space Station (© NASA)

Mitsumata (aka paperbush) in a forest in Japan (© nattya3714/Getty Images)

Crowsnest Mountain, Alberta (© Brandon van Son/TANDEM Stills + Motion)

Small red house on the rocky coast of St. John's, Newfoundland and Labrador (© Jessie Brinkman Evans/Offset)

The blue eggs of an American robin in New Jersey (© Mira/Alamy)

Square Tower House in Mesa Verde National Park, Colorado (© lightphoto/Getty Images)

Plitvice Lakes National Park, Croatia (© Janne Kahila/Getty Images)

Two mute swan chicks shelter under mom's tail feathers at Massapequa Preserve, Long Island, New York (© Vicki Jauron/Getty Images)

Sheep graze along a road, Iceland (© Matthew Kuhns/Tandem Stills + Motion)

Small lake in Karula National Park, Valgamaa County, Estonia (© Sven Zacek/Minden Pictures)

Tianjin Binhai New Area Library in Tianjin, China (© Imaginechina Limited/Alamy)

Milky Way rising above Half Dome in Yosemite National Park, California (© Cory Marshall/Tandem Stills + Motion)

Three king penguins on the shore of St. Andrew's Bay, South Georgia Island (© Paul Souders/Getty Images)

Percé Rock off the Gaspé Peninsula, Quebec (© Design Pics/DanitaDelimont.com)

Midnight sun in Svalbard, Norway (© Nature Picture Library/Alamy)

Fox kits practice their hunting skills, Quebec (© Vlad Kamenski/Shutterstock)

A young giant sequoia sprouting out of an old log in Prairie Creek Redwoods State Park, California (© Hutch Axilrod/Getty Images)

The North Beach Jazz Mural created by artist Bill Weber in San Francisco (© Kosso/Getty Images)