There are only a few days left to enter National Geographic's annual travel photography competition – entries close on 27 May 2016. Photographers can submit entries in any or all of three categories: Nature, People and Cities. The grand prize award winner will receive a seven-day polar bear photo safari for two at Churchill Wild–Seal River Heritage Lodge in Canada.

IBTimes UK presents a tiny selection of the thousands of photos submitted so far. See more – and enter your own pictures – on the National Geographic website.