The Water Tower of Union, NJ is hailed as the world’s tallest water sphere. Here are a few photos of the tower from the fields by Kawameeh Middle School:
Also see this aptly named site: The World’s Tallest Water Sphere.
Update: I have received accolades from the Water Sphere guy, thanks to our shared passion for this illustrious New Jersey landmark.
Update: Also see Lost in Jersey’s page on the Water Sphere.