The 27th annual National Geographic Traveler Photo Contest is open for entries until 30 June. Photographers can submit travel photos in four categories: Travel Portraits; Outdoor Scenes; Sense of Place; and Spontaneous Moments.

The grand prize winner will receive an eight-day National Geographic photo expedition to Costa Rica and the Panama Canal. Second prize is a six-day photo expedition in Yellowstone for two and the third prize winner will receive a six-day cruise for two from Schooner American Eagle and Heritage.

IBTimesUK presents a selection of photos that have been received so far. See more – and enter your own pictures – on the National Geographic website.