Unlike many of the other designs here, this was not just conceptual, the corner stone for it still exists and Lindenthal designed the Manhattan and Williamsburg bridges,which makes the statistics about it all the more incredible."The bridge was to be 6,000 feet long (nearly twice the length of the George Washington Bridge), 200 feet wide, and 200 feet above the river. It was designed to carry 12 railroads, 24 lanes of traffic, and 2 pedestrian promenades." The towers would have been taller than the Woolworth building.
View the entire chart: New York Retro Futurism