 Intellectual accomplishments of New Yorkers are associated with 22 sites, including nine university buildings, ten other NHLs associated with inventions, inventors or scientists, and four engineering landmarks, including two bridges that were once the longest of their types.Commercial accomplishments include 11 historic skyscrapers, five of which were once the tallest in the world, seven stock exchanges and other buildings important in commercial history, two bank buildings, five industrial facilities, and three water-based civil engineering works.Two are architectural oddities.