Paris Sewer Museum and Tour

One of the city’s odder tourist attractions, the Musée des Egouts (Paris Sewer Museum) affords visitors an intriguing glimpse into the historic sewer system, first developed around 1370 and extending very slowly in the centuries that followed. Made up of a labyrinthine network of over 1,491 miles of tunnels and “galleries,’’ much of it is architecturally stunning, having been featured in such classic works of literature as Victor Hugo’s Les Misérables and Gaston Leroux’s Phantom of the Opera.