In my OP, I alluded to "multiple" centerpieces, which I believe many of us have. Indeed, IMO, the best layouts (which mine is not) have many centerpieces.
Another expression for centerpiece(s) in the context of a layout that conveys a similar meeting, is "show stopper scenes."
I believe I have multiple centerpieces or show stopper scenes on my layout, and my #1 is my Popsicle Stick Yankee Stadium shown in my OP.
Now, for fun, I will unveil my #2. It's a tough choice, and I'm a little torn about choosing my #2, but here it is.
Drum roll please (LOL).
It's the South portion of my removable river
showing the Lionel NY Central Tugboat and the Lionel Bascule Bridge and Lionel Drawbridge, both in the raised position.
Arnold