Visit the world’s smelliest museum at Les Egouts de Paris (The Sewers of Paris). This infamous museum is part of Paris’s working sewage system. Only a small part of the 2,100km sewer system is open to the public, but you are able to get a fairly good understanding of where your waste goes when each time you flush the toilet. Included in this odorous museum is a history of the Parisian sewer system, a selection of antique sewage maintenance machinery and a token caged rat. Located at 93 quai d’Orsay, Paris, France.

John Todd is a biologist and ecological designer who believes the most effective systems are where the principles of nature are respected and utilized. John Todd Ecological Design Inc. has created eco systems ‘as old as the earth itself’ to treat grey or wastewater from sewage, called living machines or eco-machines. Living Machines are water treatment systems ecologically engineered to combine elements of conventional wastewater technology with the natural purification processes of wetland ecosystems. Natural systems use up to 75% less electricity than conventional sewage treatment plants: http://www. toddecological. com/

The UK is also home to a great sewer tour; in fact the Brighton Sewer Tour was named Best Place to Visit in Brighton in 2007. Tour highlights include seeing Europe’s largest storm water tunnel that extends for more than 4.8 km. Tours run from April to September and must be booked in advance by calling: UK 01903 272606. The cost is ?10 for adults and ?5 for children and students: http://www. southernwater. co. uk/

The Nordic Folkecenter for Renewable Energy located in Hurup, Denmark, has set up a super cool organic grey water system. Their natural sewage treatment facility uses a series of plant and organic matter filters to render the grey water clean via living plants, microorganisms, biological filters, ponds, snails and fish. Visitors are welcome through their Leader Training Program: http://www. folkecenter. net

Musee des Egouts (Brussels' Sewer Museum) has more than 350 kms of tunnels to visit during their sewer tour. The museum also has several exhibits on the sewers’ history. Open from Tuesday to Friday, with tours in French or Flemish on Thursdays and Fridays. The tour is free for residents of Brussels. Take tram 18 or bus 47 to Pavillon de l'Grant, Porte d'Anderlecht. Info: +32 (0) 2 500 70 31.

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