RIYADH: Saudi Arabia has suspended planned construction of a colossal cube-shaped skyscraper at the center of a downtown development in Riyadh while it reassesses the project's financing and feasibility, four people familiar with the matter said. The Mukaab was planned as a 400-meter by 400-meter metal cube containing a dome with an AI-powered display, the largest on the planet, that visitors could observe from a more than 300-meter-tall ziggurat — or terraced structure —inside it. Its future is now unclear, with work beyond soil excavation and pilings suspended, three of the people said.