If you’ve got a pc and are playing World of Warcraft, check out the WoWmodelview and WoWmapview, which let you fly through the World of Warcraft world and examine the 3d models in the game. This is kind of spoilerish in that you can take away some of the fun to be had exploring the world and discovering new monsters, but it can also be helpful if you’re struggling to work your way through one of the game’s instance dungeons and want to explore it offline without the penalty of dying repeatedly. Both are free, open source and relatively small downloads.