The preserved New York Central 69th Street Transfer Bridge at Riverside Park South.
As mentioned earlier, this park's site was once a New York Central freight yard. One of its (somewhat) unique features, however, was this "bridge"—in actuality a series of docks—which allowed freight cars to be loaded onto or off of barge for transportation across the Hudson. Thus, freight from parts west could get to Manhattan industries via barge and train, as well as vice-versa.
The development of freight trucks, alongside the displacement of industry from valuable Manhattan land, has sadly long since quieted these docks. However, their resting hulks bring are both a tribute to the industrial city past, as well as an aesthetic experience for the present.
As Riverside Park South was planned, there were battles over these structures: many wanted them torn down for a more "traditional" waterfront park. However, preservationists eventually won, getting the structures landmarked in 2003. Today, they are well-integrated into the space, a feature that makes the park an interesting and fun place to be.
Sometimes, the modern world needs ruin, as a monument to our past. And truly, that's what these are: at once a monument and a modern ruin. Another great piece of preservation.
Part of my (short) #RiversideParkSouthWalk .