Paul Schenk has been taking new and old data from missions to the various moons of Jupiter, Saturn, Uranus and Neptune and building 3-D models of what it might be like to fly through some of their more fascinating features. These are renders built from actual images, so often you might see areas of lower resolution due to a lack of better mission data. The one posted above of Hi'iaka Montes on Io is one of the best on his youTube page as the data available from the region is mostly in high resolution with few gaps.