There’s water in them there tanks…

"The business is definitely an art, the men are craftsmen…"(YT) NYC’s rooftop water tanks are a unique and often overlooked part of the city. Watch as one goes up (its worth the 10 minutes for the money shot at the end): "New York, is water tanks, yes."(YT)
"New York, which has thousands of cylindrical wooden rooftop water tanks with conical roofs, couldn’t exist without them." Its the only city with its own section under Wiki’s water tower page.