In September 1957, nine brave Black students crossed a line of armed soldiers to integrate Central High School in Little Rock, Arkansas, in the first major test of school desegregation after "Brown v. Board of Education" toppled the notion of "separate but equal." Though this is still an operating high school, on most days tourists stop here. They wander the grounds in clusters, pausing to stand next to the reflecting pool, pointing their cameras upward. They shield their eyes from the sun, squinting to read a sign bearing the school's name. They lean down to remind their children what happened here. This September, Little Rock will honor the 50th anniversary of the Little Rock Nine. The anniversary is more than a chance to look back and honor ordinary students who turned into heroes. It also is a chance to look forward, to see exactly how far we still must travel to achieve the promises set out in "Brown." What makes the story of the Little Rock Nine still relevant are the invisible lines, dividing schools and neighborhoods, that continue to separate Americans by race and class. This article discusses the costs of resegregation and Central High School's efforts to commemorate and apply the lessons of its own history.