Another thing W.T. got me interested in was the history of the New York water system. A lot of the old structures are still visible (Google maps) in one form or another e.g. the Great Lawn in Central Park was once a reservoir, the New York Public Library and park are built on the site of another reservoir, the beautiful High Bridge (oldest bridge in New York), now a foot bridge over the Harlem River, was originally an aqueduct and the associated water tower still stands above the western end . . .
https://en.wikipedia.org/wiki/High_Bridge_(New_York_City)