The National Geographic Travel Photographer of the Year Contest is now under way, and entries will be accepted until June 30. The grand-prize winner will receive a 10-day trip for two to the Galápagos Archipelago with National Geographic Expeditions. National Geographic was once more kind enough to allow me to share some of the early entries with you here, gathered from three categories: Nature, Cities, and People. The photos and captions were written by the photographers, and lightly edited for style.