Dis-a-pier
The Hudson River which divides New York State and New Jersey, was in years gone by a bustling and grimy port, with dozens of piers on both sides serving the many arriving and departing commercial ships.
In time virtually all commercial traffic has disappeared from the Hoboken side, and while some piers have been reclaimed for parks, others (as seen in this image) were left as piling remnants, which help promote marine life in the river, giving a whole new purpose to the disappearing piers.