In the middle of the Saudi desert, they are (already) building the city of the future. Its main object is a colossal horizontal skyscraper
One of the most ambitious architectural projects of the 21st century — Neom — is being built right now in Saudi Arabia by order of Crown Prince bin Salman.
Architects from all over the world are involved in its creation. According to the authors' vision, ski resorts, floating neighborhoods, and underground high-speed trains should appear in the middle of the desert. The key object of Neom is the mirror skyscraper "The Line" with a length of eight Manhattans. According to the prince's plan, by 2045, Neom, which will become a "state within a state," will be home to nine million people. Currently, a huge trench has been dug at the site of "The Line." Meanwhile, construction of housing for the prince himself has already been completed.
According to preliminary estimates, half a trillion dollars will be spent on the construction of the supercomplex; according to (https://www.bloomberg.com/features/2022-mbs-neom-saudi-arabia/) a former Neom employee, the amount could double during the process. But even if we rely on the estimated costs, this is already the most expensive of all known futuristic projects in the world (at least those whose cost is publicly known).

