Renowned Catalan architect Antoni Gaudí reportedly proposed the visionary Hotel Attraction for Lower Manhattan. Rising 1,180 feet, the fantastical skyscraper would have been the tallest building in the world and decades ahead of its time, with an organic, sculptural form unlike any American skyscraper of the era. Although never built—and known today only through later drawings and accounts—the design has become one of architecture's most intriguing "what if" projects.