The editors of Smithsonian magazine have announced the winners of their 12th annual photo contest, selected from more than 26,500 entries. The winning photographs from from the competition's six categories are published below: The Natural World, Travel, People, Americana, Altered Images and Mobile. Also, a few finalists have been included as well. Captions were written by the photographers. Be sure to visit the contest page at Smithsonian.com to see all the winners and finalists.