image: Marc Mascort i Boix

After terrorists brought down New York's World Trade Center, a group of artists and architects suggested replacing it with a concept originally proposed, ironically, for the same location back in 1908: famed architect Antoni Gaudi's Hotel Attraction. Soaring 1,181 feet, the rocket-shaped hotel (seen in a computerized rendering here) would have had an exhibition hall nearly 375 feet high, or 60 feet taller than the Stature of Liberty. Though never built, the colossal structure appeared in an alternate-universe New York on the TV series "Fringe."