Saudi Arabia plans to create a futuristic city called The Line. | Hashem Al-Ghaili

The Line is Saudi Arabia's ambitious, futuristic linear city project within the NEOM development, envisioned as a 170-kilometer-long, 500-meter-high mirrored city with no cars, streets, or carbon emissions, relying on renewable energy and high-speed rail for a car-free, sustainable urban life with all amenities within a 5-minute walk. Announced in 2021 as part of Vision 2030, it aims to house 9 million people, but recent reports suggest major scaling back and challenges to its full realization,