The tourism mega-cities set to spring up around the world

It may sound like something out of a Marvel movie, but mega-metropolises that claim to have mastered the perfect way of living – and holidaying – could soon entice travellers away from traditional holiday resorts. In 2017, Crown Prince Mohammad bin Salman of Saudi Arabia outlined his futuristic vision for such cities in an ambition project called NEOM, and the Middle Eastern royal promptly began constructing a revolutionary ‘eco-city’, to the tune of £1.1trillion. Eight years on, the plans have transformed part of the Red Sea coast of the country. NEOM is already a glossy mini city powered by 100…