"The Wall" is the Saudi Arabian urban marvel or nightmare. "The Wall" (Actually The Line) is straight from some SciFi movies. That structure is 170 kilometers long, 200 meters wide, and 500 meters high mega-house. That kind of structure would covered by using mirrors. And that giant house would produce its energy by using wind, sun, and geothermal energy. Some people say that "the Wall" is a maniac structure whose maintenance costs so much that it will never be autotrophic. Some people say that the purpose of Saudi Arabian megastructures like the "giant cube" in Riyadh is to offer a place or fortress for the Saudi elite. That mega-size skyscraper would be the largest building on our planet. "The Line is a planned city in Saudi Arabia, designed to be a 170 km long, 200 meters wide, and 500 meters high string of skyscrapers with a population density ten times that of Manhattan. However, researchers from the Complexity Science Hub argue th