Mary Lou Gaughin was drawn to Centralia, Pennsylvania when it had the energy of a city—it was a thriving, happy community. But 40 years ago, a fire broke out deep underground and changed everything. Joan Quigley, author of The Day the Earth Caved In, wrestles with the question of when a town really dies. And Tom Dempsey brings to life the pain of letting go of a place that's always been home.

CORRECTION: An earlier version of this piece indicated that the Dow Jones Industrial Average originated in the 1920s. In fact, it originated in the 1890s; during the 1920s it was expanded to include 30 companies, the number it includes today. The audio has been adjusted in consideration of this fact.