Cities of the Underworld

Season 1, Episode 5: Catacombs of Death

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Eric finds some knowledgeable guides to take him on a clandestine tour of the catacombs of Paris. Originally a limestone quarry, the vacant space produced its own utility and a rich history in war and in peace to hide things better kept unseen. But the catacombs also represent cracks in the foundation that threaten the stability of the city above the surface.