Not a tower in the traditional sense — this is a mirrored city stretching 170km through the desert, 500 metres tall and just 200 metres wide. The most ambitious building project in human history.

Part of Saudi Arabia's NEOM megaproject, The Line is designed to house 9 million people in a car-free linear city. The exterior is entirely mirrored glass reflecting the desert landscape. Construction began in 2023 but the project has been scaled back from original plans.