Geography, as a social studies discipline, can be a powerful tool for students to explore how their social and political worlds have been built. In this sense, the discipline can be an affirmational, positive inquiry into how humans organize in and around spaces to form communities. It can also, however, be used to explore how discriminatory practices and beliefs are acted out, in the creation of physical or conceptual boundaries. The reality of racial residential segregation is, and has been, an enduring feature of American life. It has been fostered along through the use of a variety of repressive policies, laws, and practices, but possibly the most insidious characteristic of the phenomenon is how invisible it can be, both to those it benefits and those it victimizes. This article explores the origins and continuing influence of racially restrictive covenants and the practice of redlining, as well as how teachers can use modern tools to help students see its presence in their lives.