Videogame Places You're Not Supposed To Go

The eight far-off realms in this article exist for different reasons. They could be developer test areas, or forgotten pieces of landscape that somehow made their way into the final code. Whatever their reason for being, they all have one thing in common: they weren't meant to be explored by the likes of you and me. But through persistence, hacks or some combination of the two, you can take in these rare delights for yourself. Pack your bags."
What odd, interesting, or funny game locations have you wandered into?

http://games.slashdot.org/story/09/0...Supposed-To-Go