The 26th annual National Geographic Traveler Photo Contest is now open for entries. The winner will receive an eight-day expedition to Alaska for two.

Photographers can submit travel photos in four categories: Travel Portraits, Outdoor Scenes, Sense of Place and Spontaneous Moments. Entries close on 30 June.

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