As a centuries-old legend has it, three young women attempted to cross the Potomac River late one night. They drowned in a horrific storm, however, and marked the place of their deaths with a cluster of rocks: the Three Sisters Islands. Today's kayakers and canoe paddlers may not feel the dread of the three sisters' curse, but their final promise may explain D.C.'s failure to build a bridge over these islands. If we cannot cross the river here, then nobody else ever will. The unbuilt Three Sisters Bridge played a crucial role in mid-20th century politics, especially the subway vs. freeway debates that would determine the future of transit in the nation's capital.