The tool of the future sits on a desk, but what lies behind that bright computer screen? Information floats on the surface, but the author of this article is a teacher who wants to find a way to draw students into an unforgettable learning adventure. A vision is needed, an idea that will enlist motivation and initiate a serious hunger for information. Why not build a world? This article discusses: The Web Site's Origins; The Tool in Practice; A Sample Unit; Assessment; and Feedback from Other Teachers.