In the months after 9/11, New York City faced a difficult decision. What should it do with the site where the twin towers once stood? For architecture critic Paul Goldberger, there was only one choice: rebuild.Podcast produced by David Levin. NOVA is produced by WGBH in Boston. Funding for NOVA is provided by David H. Koch, the Howard Hughes Medical Institute, the Corporation for Public Broadcasting, and public television viewers.For more science stories, visit our website at pbs.org/nova