OK, I said I was going to bed, but just as I was fixing to shut down my computer I saw the frames for these, and I couldn't resist.
NASA / JPL / SSI / Animation by Emily Lakdawalla
Cassini flies over Iapetus' equatorial ridge
As Cassini flew by Iapetus on September 10, 2007, it took 13 images of the equatorial ridge rising over the horizon. Most of the flight is over Iapetus' dark terrain, but at the very end of the animation, the white flanks of the Voyager moutains begin to appear.