American Lakes area of State Forest State Park in Colorado (© Gallery Stock)(Bing United States)

Berlin skyline at night (© Schroptschop/Getty Images)(Bing United States)

Lichen on rocks, Desolation Canyon, Utah (© Carr Clifton/Minden Pictures)(Bing United States)

Mature male Celebes crested macaque, Tangkoko National Park, Sulawesi, Indonesia (© Anup Shah/Corbis)(Bing United States)

Convento de San Gabriel monastery, San Pedro Cholula, Puebla, Mexico (© Florian Kopp/Alamy)(Bing United States)

Hanging bridge across Tsocowis Creek, West Coast Trail on Vancouver Island, British Columbia, Canada (© Sergio Ballivian/Tandem Stock)(Bing United States)

Iguazu River, Brazil (© Frans Lanting/Corbis)(Bing United States)

Moose cow and calf, Kincaid Park, Anchorage, Alaska (© Michael Jones/Corbis)(Bing United States)

Princes Pier at dusk, Melbourne, Australia (© Getty Images)(Bing United States)

Bohemian Switzerland National Park, Czech Republic (© Filip Molcan/500px)(Bing United States)

St. Louis skyline and Gateway Arch, Missouri (© Mary Ann Melton/Alamy)(Bing United States)

Axolotl (© John Cancalosi/Getty Images)(Bing United States)

Close-up of bicycle chain (© Ocean/Corbis)(Bing United States)

Graduation celebration, United States Air Force Academy, with U.S. Air Force Thunderbirds, Colorado Springs, Colorado (© Leigh Vogel/Corbis)(Bing United States)

Housing development, West Palm Beach, Florida (© Paul Nicklen/Corbis)(Bing United States)

Herzliya, Israel (© Dima Shapira/500px)(Bing United States)

Compound eye of a female Asian tiger mosquito (© Dennis Kunkel Microscopy, Inc./Corbis)(Bing United States)

Kingfishers, Taipei, Taiwan (© htu/Flickr Select/Getty Images)(Bing United States)

London Eye, Big Ben, and Palace of Westminster, London, England (© Gavin Hellier/Alamy)(Bing United States)

Angel Oak Tree, Johns Island, South Carolina (© Haraldur Stefansson/Alamy)(Bing United States)

Flamingos take flight, Lake Magadi, Kenya (© Bobby Haas/Getty Images)(Bing United States)

Aerial view of Petra, Jordan (© Annie Griffiths Belt/Getty Images)(Bing United States)

Field of flags displayed for Memorial Day, Boston, Massachusetts (© Paul Marotta/Getty Images)(Bing United States)

Cliffs and lighthouse at Beachy Head, East Sussex, England (© Malcolm Park/Corbis)(Bing United States)

Printing press letters (© REX/Design Pics Inc)(Bing United States)

Ha Long Bay, Vietnam (© AirPano)(Bing United States)

Danyang County in North Chungcheong Province, South Korea (© Sungjin Kim/500px)(Bing United States)

A young Galápagos sea lion on South Plaza Island, Galápagos archipelago, Ecuador (© Michael Durham/Tandem Stock)(Bing United States)