As a 170-kilometre-long mirrored megacity in the Saudi desert makes headlines, here is a roundup of 10 futuristic cities currently being planned across the globe.

Global issues such as the housing crisis and climate change are galvanising ambitions for a new generation of high-tech cities.

The Line, a 500-metre-tall skyscraper that will house nine million people in northwestern Saudi Arabia, as shown in this video, is the most recent example but not the only one.

BIG, Foster + Partners and OMA are among multiple architecture studios helping to masterplan futuristic urban centres, which often claim to be designed with a focus on sustainability.

Below are 10 ambitious cities set to be built in the coming decades:

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