Over the last 18 years, readers have submitted more than 470,000 images to Smithsonian’s annual photo contest. These photos have transported viewers to the far corners of Earth, captured spectacular, split-second moments and introduced them to fascinating people and unique landscapes.  The Grand Prize, Readers’ Choice prize, Natural World, Travel, People, The American Experience, Altered Images and Mobile category prizes are open to photographers who are 18 years old or older.

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