Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online.The Mile High Illinois, Illinois Sky-City, or simply The Illinois was a proposed mile-high (1,609 meters/5,280 feet) skyscraper, envisioned by Frank Lloyd Wright in 1956. The design, intended to be built in Chicago, would have included 528 stories, with a gross area of 18.46 million square feet (1.71 million square meters/171 hectares). Had it been built, it would be the tallest building in the world.This is arguably the most famous of the semi-serious visionary buildings meant to be an alternative to the increasing urban sprawl occurring in most cities. None of these have ever been viewed as financially feasible.