The visualization I liked the best in Interstellar was that of the wormhole, seen from the outside. (The "travel" through it was rubbish.)
The thing would look like a mirror sphere, floating in the middle of space, reflecting the space around you. Except it would be the space on the other side of the wormhole, not that behind you, and the motion of the "mirrored" image would be opposite of that on a real mirror. (The apparent image on the wormhole's spherical surface would appear to move in your same direction, as you're moving around it, not in the opposite direction as it does on a spherical mirror.)
It took me a while to reason about it and figure out that it was indeed what a wormhole would look like, if we could find or create one.
https://youtu.be/f3ptQ0CPMmU
