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Paris sewer
Pont de l'Alma, Paris, France (Eiffel Tower / Invalides / Palais-Bourbon Phone: 33-1-53-68-27-81About
The Paris sewer system has 2,100km of tunnels. Fortunately, the tour visits only a small section but fans will delight at an overflow outlet, a secondary conduit, sand-filter basins and much more. It gets cold down there so do wear a sweater.