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It's hard to imagine a New York different from the one we know, but what would the city have been like if the ideas of some of the greatest architectural dreamers had made it beyond the drawing boards and into built form? The new book Never Built New York paints the picture of an alternative New York with renderings, sketches, models, and stories of proposals for the city that never came to be. For this week's episode of the New York Public Library Podcast, internationally acclaimed architects Daniel Libeskind, Steven Holl, and Elizabeth Diller come together with author Sam Lubell to envision this alternate city.