Paris Sewer Museum, Paris, France

Paris Sewer Museum, Paris, France

Sure, travellers flock to the Louvre and the Eiffel Tower, but there is also the less conventional attraction: the Paris Sewer Museum. First opened to the public in 1867, the sewer tunnels running underneath Paris are where visitors can gain first-hand knowledge of the history and inner workings of the city's sewer system.

“The museum is modern, nicely laid out, very informative and with lots of history, photos, machines and object concerning the French sewer system,” added a TripAdvisor traveller.