This video shows the design for The Line, a 500-metre-tall, mirror-clad skyscraper that was designed to house nine million people in Saudi Arabia.
The linear city, which will be 170 kilometres long and 200 metres wide, was launched by Saudia Arabia's crown prince Mohammed bin Salman and is described as "a revolution in civilization."
It will have a footprint of just 34 square kilometres and house nine million people, who will live in neighbourhoods where all daily needs are accessible within a five-minute walk.
The linear city's infrastructure will make it possible to travel from end to end in twenty minutes, according to its designers, meaning there will be no need for cars.
The Line is planned as part of the Neom initiative and Saudi Arabia's Vision 2030 drive to diversify its economy and become less reliant on oil.