Eastern State Penitentiary

This guide to Eastern State Penitentiary in Philadelphia asks how a plasterer named Clarence Klinedinst could cut a hole big enough for a man into his own cell wall, inspected daily, without a single guard noticing for almost a year. It follows him chipping downward each night with masonry picks and flattened spoons, hauling debris away in his pockets while his cellmate stood watch, and it names the small, sharp-featured bank robber who joined his plan: Willie Sutton, already notorious for slipping out of other prisons. Stand where the tunnel once ran, still buried beneath the exercise yard for decades before anyone found it again.