The 27th annual National Geographic Traveler Photo Contest is underway; entries will be accepted until the end of the month, June 30, 2015. First-prize winner will receive an eight-day photo expedition for two, to Costa Rica and the Panama Canal. Official categories include: Travel Portraits; Outdoor Scenes; Sense of Place; and Spontaneous Moments. You can also check the site weekly to see photo galleries of the top entries.