Saturn is already one of the most beautiful objects in the Solar System. But here is what I think is one of
most incredible pictures ever of Saturn. The Cassini spacecraft is behind Saturn as the ringed planet blocks the sunlight from Cassini's view. But you can see the ringshine on the lower half of the dark side of Saturn.
But there's something else almost unique in this image. Look hard at the far left of the picture just above the bright rings to try to find a tiny white dot. (You might need to click on the picture to go to the higher res Wikimedia version.) That is Earth.