Since the Verrazano Bridge was finished in 1964, I’ve been in John Paul Jones Park, at 4th Avenue and Shore Road-101st Street, perhaps hundreds of times, but never gave this object a second thought. I never inspected it up close, thinking it to be a storage tank of some kind.
It’s actually a suspension cable from the bridge itself. Since everyday pedestrians have been allowed on the bridge only once (in 1989, the bridge’s 25th anniversary — maybe 2014, the 50th?) and bicyclists and NYC marathoners once a year, it’s hard to be up close and se how massive these cables really are!