Down to Hades: A Chthonic Odyssey

With this second installment of their series on sacred geography, Fr. Stephen De Young and Fr. Andrew Stephen Damick take a journey into the shadowy and much-misunderstood realm of the dead—the Underworld, Hades, Hell, Sheol, the Grave. Do these words mean the same thing? Where is this place? And who or what exactly is there?