At a press conference in Chicago in 1956, when he was 87 years old, architect Frank Lloyd Wright unveiled his plan for what would come to be known as The Mile High Illinois, a skyscraper four times the height of the Empire State Building that would dwarf the world’s current tallest building, the 2,717-ft.-tall Burj Khalifa in Dubai, at 5,280 ft. The never-realized Mile High would have had more than 500 floors and be powered by 76, nuclear-powered, five-deck elevators. Even at that, a modern-day elevator consultant told The New Yorker this would have fallen far short. James Fortune said up to 225 elevators would have been needed. The architect’s “lost masterpiece” had a lot of other technical issues, which you can read all about in The Daily Beast.