Horseshoe Bend, Glen Canyon, Arizona

Horseshoe Bend (Photo: poorpoor/Flickr)

Snæfellsnes-og Hnappadalssýsla, Iceland

Horses and aurora borealis in Iceland (Photo: Greg Annandale/Flickr)

Hamilton Pool, Austin, Texas

People wade in water cave grotto(Photo: Stuck in Customs/Flickr)

Glacier Grey, Torres del Paine National Park, Chile

Hiker walking in glacier in Chile(Photo: Dietmar Temps/Flickr)

Pansarine, Tuscany, Italy

Tuscany(Photo: hippydreams/Flickr)

Muir Woods, California

Muir Woods (Photo: kern.justin/Flickr)

Minnehaha Falls, Minnesota

Frozen Minnehaha Falls(Photo: Mary JI/Flickr)

Mount Blanc, France

Yellow flowers and mountains(Photo: OneEighteen/Flickr)

Star Trails, Rio Negro, Argentina

Star trails (Photo: lrargerich/Flickr)

Sicily, Italy

Moon rise over Sicily (Photo: gnuckx/Flickr)

Tereia Beach, Maupiti, Leeward Islands

Maupiti coral reefs(Photo: SF Brit/Flickr)

Namib Desert, Namibia

Namib desert (Photo: mariusz kluzniak/Flickr)

Catie Leary ( @catieleary ) writes about science, travel, animals and the arts.

Earth Day photos: Celebrating the beauty of our planet
In celebration of Mother Earth, here are 12 stunning photos showcasing the diverse collection of landscapes found across the planet.