Spelunking Through the Historic Sewers of Paris, France
"Paris has another Paris under herself; a Paris of sewers; which has its streets, its crossings, its squares, its blind alleys, its arteries, and its circulation, which is slime, minus the human form. "
—Victor Hugo, Les Miserables, 1862
Every street in Paris runs above a sewer tunnel with its own subterranean street sign, which you'll find necessary to navigate the 400 year-old, 1,300-mile warren of les égouts — the city's vast and sometimes cavernous waste disposal network. Visit the Paris Sewer Museum to check out the antique flusher trolleys still in use today, then take a private walking tour to really soak it all up. Sewer expeditions have been one of the city's more unusual attractions since 1867, when the first public tours commenced and mechanical carts were employed to roll visitors through the fascinating, albeit dank, Parisian underworld.