http://en.wikipedia.org/wiki/Special:Randompage
The second link in our series requires a short explanation. It basically directs you to a random page on the wikipedia site. Simple as that. As far as I can tell it seems to be a feature of the wikimedia software that runs the wikipedia site and various others. So it should work any other wiki that runs off the wikimedia software.
I’ve found some very wierd things since I initially discovered this about a year ago, one thing being that Countries, Citys and Rivers seem to make up the vast majority of the Wikipedia database.
Have fun browsing.