Wikipedia Maze is for you. Wikipedia Maze is a community-powered site featuring puzzles based on Wikipedia articles. The challenge is to figure out how someone got from one topic to another in as few links as possible. For example, can you figure out how I got from Andrew Carnegie to Richardson's Ground Squirrel in six clicks?
The Tekzilla video below has a short overview of Wikipedia Maze.
Applications for Education
If you're looking to give some structure to your students' exploration of Wikipedia, Wikipedia Maze could be a nice way to do that. You can create your own mazes or have students create them and share them with each other. Who knows what they might discover along the way?