BBB Destination - des égouts de Paris
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Until recent times, the Paris sewers also carried tourists: initially by carts that were suspended from the walkways along the tunnel walls, later by carriages drawn by a small locomotive, and--until the 1970s--in boats. (I toured an égout in 1966, when municipal workers used chains to haul the wooden boat through a sewer tunnel from the Madeleine to the Place de la Concorde.)
Today, the carts and boats are gone, having been replaced by an even better attraction: the Musée des égouts de Paris, or Paris Sewers Museum. This museum of the Mairie de Paris is located in the sewers beneath the Quai d'Orsay on the Left Bank, and it's a "must see" destination for any visitor who's interested in engineering, public works, or unusual tourist attractions--and for fans of Victor Hugo's novel, Les Misérables, and the musical that it inspired.
Listen to a humorous review of the Paris Sewer Tour (requires RealPlayer)
The Museum and Tours are closed the last three weeks of January (and every Thursday & Friday), so now is a good time to make plans to visit but not actually visit this site of sites.