Oxbow Bend on the Snake River, Grand Teton National Park, Wyoming (© DanitaDelimont.com/AWL Images/SuperStock)

Clark Range, Sierra Nevada, Yosemite National Park, California (© Robb Hirsch/TANDEM Stills + Motion)

Koala in a eucalyptus tree, Great Otway National Park, Australia (© Jamie Lamb - elusive-images.co.uk/Getty Images)

The Rainbow Houses of Houten, Netherlands (© George Pachantouris/Getty Images)

Town of Pienza in Tuscany, Italy (© zpagistock/Getty Images)

Tank Lakes, Alpine Lakes Wilderness, Washington (© Austin Trigg/TANDEM Stills + Motion)

Least chipmunk, Kootenai National Forest, Montana (© Donald M. Jones/Minden Pictures)

Chittorgarh Fort, Rajasthan, India (© chetansoni/Shutterstock)

Devils Tower National Monument, Wyoming (© Laura Hedien/Getty Images)

Keel-billed toucan in Costa Rica (© Juan Carlos Vindas/Getty Images)