What would you do with an enormous fortune at your fingertips? These lucky billionaires don’t have to daydream. Instead, they’re turning their wildest visions into reality and using their vast fortunes to construct utopian cities across the Earth… and beyond.

Read on to discover seven jaw-dropping cities of the future being shaped by today’s billionaires, from Elon Musk’s Mars colonies to Crown Prince Mohammed bin Salman’s desert 'gigacity'.

All dollar amounts in US dollars.