Earlier this month we presented some of the breathtaking entries into the People category of the 2018 National Geographic Travel Photographer of the Year Contest.

Now we can reveal some of the National Geographic editors' favourite photos from the Cities category of the competition, which showcase a range of bustling metropolises in all their glory.

They include amazing aerial shots and candid street views.

One image shows the high-rise city of Hong Kong shrouded in an extremely thick fog, while another photo captures the awesome mountainous landscape surrounding the colourful buildings packed into Nepal's capital, Kathmandu.

There are three categories in the competition, which closes on May 31 - Nature, People and Cities. One of the category winners will be named the overall grand-prize winner and receive $10,000, have his or her photo posted on the @NatGeoTravel Instagram account and earn the title of National Geographic Travel Photographer of the Year. The other two category winners will each be awarded $2,500.

Contestants can visit natgeo.com/travelphotocontest to submit their best photos in any or all of the three categories. Here we present 10 of the most impressive pictures in the Cities category.