Paris Glossary : The Marais - Comprised of roughly the 3rd and 4th arrondissements (Right Bank) it is a quartier which has retained many small streets and hints at how Old Paris looked. Haussmann - This Baron was responsible for the significant urban planning project of 1852 - 1870. The twenty arrondissements date from this time. Haussmann puswhed through many of the major boulevards through the old sections of the city. Métro - the Paris subway. It is extensive and serves nearly every corner of the city. The last trains are around 00h30. RER - Réseau Express Régional; similar to the Métro except that it also serves the outlying suburbs and regions of Paris. In the center of the city, the distance between RER stations is more significant than for the Métro; an advantage if you want to go larger distances quickly - even in the center of the city. Bateaux Mouches - This is the name given to tourist boats which ply the Seine. Literally translated it means the ``fly boats''. The name probably comes from the district of Lyon - ``La mouche'' - the place where such boats were commonplace before they were in Paris.