Voyager II, unlike its twin Voyager I, continued on to the two ice giants. We have had only one spacecraft vist Neptune, But Voyager II did send back a great number of revealing images. Of course Neptune has a number of moons, but we can focus on the big one which seems out of place, Triton. As with the other three giant planets in our solar system, Neptune has a system of rings which surround it. This ring system has some unique characteristics. Here is a rather long, though informative, documentary about Voyager II’s encounter with Neptune.
Carpe Caelum Planetary Astronomy