In the Metro Kingdom, there is a small area in which you ride a motor scooter with a dinosaur chasing you. The "Motor Scooter: Escape!" and "Big Jump: Escape!" Power Moons are located here. At the end of this section, there is a jump, where the dinosaur falls into a pit while you escape. After this jump, the third building on the left wall is short enough that you could feasibly reach it with a well-timed jump off of the scooter.
I have tried to make it to the top of this building many times, since there are often secrets in places like this in the game. Specifically, I was looking for Power Moons and Purple Coins. I have not been able to land the jump, or grab the ledge, even when the scooter is right next to this building, at the same height as the roof.
In my last attempt, it looked to me like I was wall-sliding down the empty space above this building! Is there an invisible wall there, or was I mistaken in what I was seeing? I'd much rather not waste any more time on something impossible.