Musée des Egouts de Paris [Pont de Alma, opposite 93 Quai d’Orsay, +33 153682781 ad/ch €4.30/Free] is the closest the French will get to uncouth. Intended to educate visitors on the vast sewer network that lies in Paris’ underbelly, the museum is located in an actual working sewer pipe. The museum tour takes you through a tunnel with real sewage running under it; leading you to a gallery, which displays artefacts that document the evolution of the Paris waste disposal system since the 19th century (when a proper sewage network was built). Enter via a maintenance hole that is marked by a kiosk and don’t bother holding your breath, as the entire tour takes about an hour.