This may be old news, but I just read about it yesterday.
In 1908, the great Antoni Gaudí i Cornet made some rough designs for a skyscraper hotel in New York - called the Hotel Attraction. The project was obviously unrealized.
However, a group of American and Catalan architects rediscovered the plans, finished them, and submitted them among the many competing proposals for buildings on the space where the World Trade Center once stood.
This website is devoted to the project, and collects news articles written about it. Be sure to disable a pop-up blocker befor visiting - all the content displays in a flurry of new windows.
One of the men who worked on the proposal is Boston-based artist and architect Paul Laffoley, who has a few drawings of it displayed on his website, in Gallery 3.
More here, here, here, and here.